#include <bits/stdc++.h>
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wsign-conversion"
//!===========================================================!//
//!  dP     dP                          dP                    !//
//!  88     88                          88                    !//
//!  88aaaaa88a .d8888b. .d8888b. .d888b88 .d8888b. 88d888b.  !//
//!  88     88  88ooood8 88'  '88 88'  '88 88ooood8 88'  '88  !//
//!  88     88  88.  ... 88.  .88 88.  .88 88.  ... 88        !//
//!  dP     dP  '88888P' '88888P8 '88888P8 '88888P' dP        !//
//!===========================================================!//
using ld = long double;
using ll = long long;
using ull = unsigned long long;
std::mt19937 mt{std::random_device{}()};
template <typename T>
constexpr T INF = std::numeric_limits<T>::max() / 4;
template <typename T>
constexpr T MOD = static_cast<T>(1000000007);
template <typename F>
constexpr F PI() { return 3.1415926535897932385; }
#define SHOW(...) (std::cerr << "(" << #__VA_ARGS__ << ") = ("), HogeHogeSansuu(__VA_ARGS__), std::cerr << ")" << std::endl;
struct has_debugPrint_impl
{
    template <class T>
    static auto check(T&& x) -> decltype(x.debugPrint(), std::true_type{});
    template <class T>
    static auto check(...) -> std::false_type;
};
template <class T>
class has_debugPrint : public decltype(has_debugPrint_impl::check<T>(std::declval<T>()))
{
};
template <bool>
struct HogeHogeDump
{
    template <typename T>
    static void dump(const T& x) { x.debugPrint(); }
};
template <>
struct HogeHogeDump<false>
{
    template <typename T>
    static void dump(const T& x) { std::cerr << x; }
};
void HogeHogeSansuu() { ; }
template <typename T>
void HogeHogeSansuu(const T& x) { HogeHogeDump<has_debugPrint<T>::value>::dump(x); }
template <typename T, typename... Args>
void HogeHogeSansuu(const T& x, Args... args) { HogeHogeDump<has_debugPrint<T>::value>::dump(x), std::cerr << ",", HogeHogeSansuu(args...); }
template <typename T>
bool chmin(T& a, const T& b) { return a = std::min(a, b), a == b; }
template <typename T>
bool chmax(T& a, const T& b) { return a = std::max(a, b), a == b; }
template <typename T, typename F>
void For(const T s, const T t, const F f)
{
    for (T i = s; i != t; i += T(s < t ? 1 : -1)) { f(i); }
}
template <typename T, typename F>
void Rep(const T N, const F f) { For<T, F>(0, N, f); }
template <typename T, typename F>
void RRep(const T N, const F f) { For<T, F>(N - 1, -1, f); }
template <typename T>
std::vector<T> Vec(const std::size_t n, T v) { return std::vector<T>(n, v); }
template <class... Args>
auto Vec(const std::size_t n, Args... args) { return std::vector<decltype(Vec(args...))>(n, Vec(args...)); }
template <typename T>
constexpr T PopCount(const T u)
{
    unsigned long long v = static_cast<unsigned long long>(u);
    return v = (v & 0x5555555555555555ULL) + (v >> 1 & 0x5555555555555555ULL), v = (v & 0x3333333333333333ULL) + (v >> 2 & 0x3333333333333333ULL), v = (v + (v >> 4)) & 0x0F0F0F0F0F0F0F0FULL, static_cast<T>(v * 0x0101010101010101ULL >> 56 & 0x7f);
}
template <typename T>
constexpr T log2p1(const T u)
{
    unsigned long long v = static_cast<unsigned long long>(u);
    return v = static_cast<unsigned long long>(v), v |= (v >> 1), v |= (v >> 2), v |= (v >> 4), v |= (v >> 8), v |= (v >> 16), v |= (v >> 32), PopCount(v);
}
template <typename T>
constexpr bool ispow2(const T v) { return (v << 1) == (T(1) << (log2p1(v))); }
template <typename T>
constexpr T ceil2(const T v) { return ispow2(v) ? v : T(1) << log2p1(v); }
template <typename T>
constexpr T floor2(const T v) { return v == 0 ? T(0) : ispow2(v) ? v : T(1) << (log2p1(v) - 1); }
template <typename T>
struct Accum
{
    template <typename InIt>
    Accum(const InIt first, const InIt last) : accum(std::size_t(std::distance(first, last))) { std::partial_sum(first, last, accum.begin()); }
    T sum(const std::size_t i) const { return i == 0 ? T(0) : accum[i - 1]; }
    T sum(const std::size_t l, const std::size_t r) const { return sum(r) - sum(l); }
    std::vector<T> accum;
};
template <typename T>
struct Accum2D
{
    Accum2D(const std::vector<std::vector<T>>& t) : accum{t}
    {
        for (std::size_t i = 0; i < accum.size(); i++) {
            for (std::size_t j = 1; j < accum[i].size(); j++) { accum[i][j] += accum[i][j - 1]; }
        }
        for (std::size_t i = 1; i < accum.size(); i++) {
            for (std::size_t j = 0; j < accum[i].size(); j++) { accum[i][j] += accum[i - 1][j]; }
        }
    }
    T sum(const std::size_t y, const std::size_t x) const { return y == 0 or x == 0 ? T(0) : accum[y - 1][x - 1]; }
    T sum(const std::size_t ymin, const std::size_t ysup, const std::size_t xmin, const std::size_t xsup) const { return sum(ysup, xsup) - sum(ymin, xmin); }
    std::vector<std::vector<T>> accum;
};
template <typename T>
struct Zip
{
    template <typename InIt>
    Zip(const InIt first, const InIt last) : unzip(std::size_t(std::distance(first, last)))
    {
        std::copy(first, last, unzip), std::sort(unzip.begin(), unzip.end()), unzip.erase(std::unique(unzip.begin(), unzip.end()), unzip.end());
        for (std::size_t i = 0; i < unzip.size(); i++) { zip[unzip[i]] = i; }
    }
    std::vector<T> unzip;
    std::map<T, std::size_t> zip;
};
template <typename T, std::size_t N>
std::ostream& operator<<(std::ostream& os, const std::array<T, N>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
template <typename T, typename A>
std::ostream& operator<<(std::ostream& os, const std::deque<T, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
template <typename K, typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::multimap<K, T, C, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
    return (os << "]" << std::endl);
}
template <typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::multiset<T, C, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
template <typename K, typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::map<K, T, C, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
    return (os << "]" << std::endl);
}
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, const std::pair<T1, T2>& v) { return (os << "<" << v.first << "," << v.second << ">"); }
template <typename T1, typename T2, typename T3>
std::ostream& operator<<(std::ostream& os, const std::priority_queue<T1, T2, T3>& v)
{
    auto q = v;
    os << "[";
    while (not q.empty()) { os << q.top() << ",", q.pop(); }
    return os << "]\n";
}
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, const std::queue<T1>& v)
{
    auto q = v;
    os << "[";
    while (not q.empty()) { os << q.front() << ",", q.pop(); }
    return os << "]\n";
}
template <typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::set<T, C, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, const std::stack<T1>& v)
{
    auto q = v;
    os << "[";
    while (not q.empty()) { os << q.top() << ",", q.pop(); }
    return os << "]\n";
}
template <typename K, typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_multimap<K, T, H, P, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
    return (os << "]" << std::endl);
}
template <typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_multiset<T, H, P, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
template <typename K, typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_map<K, T, H, P, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
    return (os << "]" << std::endl);
}
template <typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_set<T, H, P, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
template <typename T, typename A>
std::ostream& operator<<(std::ostream& os, const std::vector<T, A>& v)
{
    os << "[";
    for (const auto& e : v) { os << e << ","; }
    return (os << "]" << std::endl);
}
//!=================================================!//
//!   .88888.                             dP        !//
//!  d8'   '88                            88        !//
//!  88        88d888b. .d8888b. 88d888b. 88d888b.  !//
//!  88   YP88 88'  '88 88'  '88 88'  '88 88'  '88  !//
//!  Y8.   .88 88       88.  .88 88.  .88 88    88  !//
//!   '88888'  dP       '88888P8 88Y888P' dP    dP  !//
//!                              88                 !//
//!                              dP                 !//
//!=================================================!//
struct Graph
{
    Graph(const std::size_t v) : V{v}, edge(v), rev_edge(v) {}
    void addEdge(const std::size_t from, const std::size_t to) { edge[from].push_back(to), rev_edge[to].push_back(from); }
    const std::vector<std::size_t>& operator[](const std::size_t i) const { return edge[i]; }
    void debugPrint() const
    {
        std::cerr << "[\n";
        for (std::size_t i = 0; i < V; i++) {
            for (const std::size_t to : edge[i]) { std::cerr << i << "->" << to << "\n"; }
        }
        std::cerr << "]\n";
    }
    const std::size_t V;
    std::vector<std::vector<std::size_t>> edge, rev_edge;
};
//!===================================================================!//
//!  dP                               dP        oo          dP        !//
//!  88                               88                    88        !//
//!  88        .d8888b. dP  dP  dP    88        dP 88d888b. 88  .dP   !//
//!  88        88'  '88 88  88  88    88        88 88'  '88 88888"    !//
//!  88        88.  .88 88.88b.88'    88        88 88    88 88  '8b.  !//
//!  88888888P '88888P' 8888P Y8P     88888888P dP dP    dP dP   'YP  !//
//!===================================================================!//
class LowLink
{
private:
    using P = std::pair<std::size_t, std::size_t>;
    const std::size_t V;
    std::vector<P> bridges;
    std::vector<std::size_t> ord, low, arts;
    std::vector<bool> isart;

public:
    LowLink(const Graph& g) : V(g.V), ord(V, V), low(V, 0), isart(V, false)
    {
        std::size_t num = 0;
        auto dfs = [&](auto&& self, const std::size_t s, const std::size_t prev) -> void {
            ord[s] = low[s] = num++;
            std::size_t child = 0;
            for (const std::size_t to : g.edge[s]) {
                if (to == prev) { continue; }
                if (ord[to] != V) {
                    low[s] = std::min(low[s], ord[to]);
                } else {
                    child++, self(self, to, s), isart[s] = isart[s] | (prev != V and low[to] >= ord[s]), low[s] = std::min(low[s], low[to]);
                    if (this->isBridge(s, to)) { bridges.push_back({std::minmax(s, to)}); }
                }
            }
            isart[s] = isart[s] | (prev == V and child >= 2);
            if (isart[s]) { arts.push_back(s); }
        };
        for (std::size_t i = 0; i < V; i++) {
            if (ord[i] != V) { continue; }
            dfs(dfs, i, V);
        }
    }
    bool isBridge(const std::size_t i, const std::size_t j) const { return (ord[i] < ord[j]) ? ord[i] < low[j] : ord[j] < low[i]; }
    bool isArt(const std::size_t i) const { return isart[i]; }
    const std::vector<P>& getBridges() const { return bridges; }
    const std::vector<std::size_t>& getArts() const { return arts; }
};
//!======================================================================================!//
//!   888888ba  oo                                a88888b.                               !//
//!   88    '8b                                  d8'   '88                               !//
//!  a88aaaa8P' dP .d8888b. .d8888b. 88d888b.    88        .d8888b. 88d8b.d8b. 88d888b.  !//
//!   88   '8b. 88 88'  '"" 88'  '88 88'  '88    88        88'  '88 88''88''88 88'  '88  !//
//!   88    .88 88 88.  ... 88.  .88 88    88    Y8.   .88 88.  .88 88  88  88 88.  .88  !//
//!   88888888P dP '88888P' '88888P' dP    dP     Y88888P' '88888P' dP  dP  dP 88Y888P'  !//
//!                                                                            88        !//
//!                                                                            dP        !//
//!======================================================================================!//
class BCC
{
public:
    BCC(const Graph& g) : V{g.V}, comp(V, V), lowlink(g)
    {
        auto dfs = [&](auto&& self, const std::size_t s) -> void {
            comp[s] = comp_num;
            for (const std::size_t to : g.edge[s]) {
                if (comp[to] != V or lowlink.isBridge(s, to)) { continue; }
                self(self, to);
            }
        };
        for (std::size_t i = 0; i < V; i++) {
            if (comp[i] != V) { continue; }
            dfs(dfs, i), comp_num++;
        }
    }
    Graph toTree() const
    {
        Graph tree(comp_num);
        for (const auto& p : lowlink.getBridges()) { tree.addEdge(comp[p.first], comp[p.second]), tree.addEdge(comp[p.second], comp[p.first]); }
        return tree;
    }
    const std::vector<std::size_t>& getComp() const { return comp; }

private:
    std::size_t V, comp_num = 0;
    std::vector<std::size_t> comp;
    const LowLink lowlink;
};
//!==================================!//
//!  dP     dP  dP        888888ba   !//
//!  88     88  88        88    '8b  !//
//!  88aaaaa88a 88        88     88  !//
//!  88     88  88        88     88  !//
//!  88     88  88        88    .8P  !//
//!  dP     dP  88888888P 8888888P   !//
//!==================================!//
class HLD
{
public:
    HLD(Graph& g, const std::size_t r = 0) : par(g.V, g.V), top(g.V, g.V), in(g.V, g.V), out(g.V, g.V)
    {
        const std::size_t N = g.V;
        std::vector<std::size_t> sz(N, 1);
        auto dfs1 = [&](auto&& self, const std::size_t s, const std::size_t p) -> std::size_t {
            par[s] = p;
            for (std::size_t& to : g.edge[s]) {
                if (p == to) { continue; }
                sz[s] += self(self, to, s);
                if (sz[to] > sz[g.edge[s][0]]) { std::swap(to, g.edge[s][0]); }
            }
            return sz[s];
        };
        dfs1(dfs1, r, N);
        top[r] = r;
        auto dfs2 = [&](auto&& self, const std::size_t s, const std::size_t p, std::size_t& ind) -> void {
            in[s] = ind++;
            for (const std::size_t to : g.edge[s]) {
                if (to == p) { continue; }
                top[to] = (to == g.edge[s][0] ? top[s] : to);
                self(self, to, s, ind);
            }
            out[s] = ind;
        };
        std::size_t ind = 0;
        dfs2(dfs2, r, N, ind);
    }
    std::size_t at(const std::size_t v) const { return in[v]; }
    std::pair<std::size_t, std::size_t> sub(const std::size_t v) const { return {in[v], out[v]}; }
    std::vector<std::pair<std::size_t, std::size_t>> path(std::size_t u, std::size_t v, const bool edgeWeight = false) const
    {
        using P = std::pair<std::size_t, std::size_t>;
        std::vector<P> head, tail;
        for (std::size_t pu = top[u], pv = top[v]; pu != pv;) {
            if (in[pu] < in[pv]) {
                tail.push_back({in[pv], in[v]});
                v = par[pv], pv = top[v];
            } else {
                tail.push_back({in[u], in[pu]});
                u = par[pu], pu = top[u];
            }
        }
        if (edgeWeight) {
            if (std::abs((int)in[u] - (int)in[v]) >= 1) { head.push_back(in[u] < in[v] ? P{in[u] + 1, in[v]} : P{in[u], in[v] + 1}); }
        } else {
            head.push_back({in[u], in[v]});
        }
        std::reverse(tail.begin(), tail.end());
        for (const auto& p : tail) { head.push_back(p); }
        return head;
    }

private:
    std::vector<std::size_t> par, top, in, out;
};
//!===================================================================!//
//!  .d88888b                    d888888P                             !//
//!  88.    "'                      88                                !//
//!  'Y88888b. .d8888b. .d8888b.    88    88d888b. .d8888b. .d8888b.  !//
//!        '8b 88ooood8 88'  '88    88    88'  '88 88ooood8 88ooood8  !//
//!  d8'   .8P 88.  ... 88.  .88    88    88       88.  ... 88.  ...  !//
//!   Y88888P  '88888P' '8888P88    dP    dP       '88888P' '88888P'  !//
//!                          .88                                      !//
//!                      d8888P                                       !//
//!===================================================================!//
template <typename Monoid>
class SegTree
{
public:
    using BaseMonoid = Monoid;
    using T = typename Monoid::T;
    SegTree(const std::size_t N, const T initial = Monoid::id()) : size(N), half(ceil2(size)), value(half << 1, Monoid::id())
    {
        if (initial != Monoid::id()) {
            std::fill(value.begin() + half, value.end(), initial);
            for (std::size_t i = half - 1; i >= 1; i--) { up(i); }
        }
    }
    template <typename InIt>
    SegTree(const InIt first, const InIt last) : size(std::distance(first, last)), half(ceil2(size)), value(half << 1, Monoid::id())
    {
        std::copy(first, last, value.begin() + half);
        for (std::size_t i = half - 1; i >= 1; i--) { up(i); }
    }
    T get(const std::size_t a) const { return value[a + half]; }
    void set(std::size_t a, const T& val)
    {
        value[a += half] = val;
        while (a >>= 1) { up(a); }
    }
    T accumulate(std::size_t L, std::size_t R) const
    {
        T accl = Monoid::id(), accr = Monoid::id();
        for (L += half, R += half; L < R; L >>= 1, R >>= 1) {
            if (L & 1) { accl = acc(accl, value[L++]); }
            if (R & 1) { accr = acc(value[--R], accr); }
        }
        return acc(accl, accr);
    }
    template <typename Pred>
    std::size_t partitionPoint(const std::size_t L, const std::size_t R, const Pred& pred) const
    {
        auto prec = [&](auto&& self, const std::size_t index, const std::size_t left, const std::size_t right, const T& offset) -> std::pair<T, std::size_t> {
            if (right <= L or R <= left or pred(acc(offset, value[index]))) { return {Monoid::id(), R}; }
            if (index >= half) { return {value[index], index - half}; }
            const std::pair<T, std::size_t> lans = self(self, index << 1, left, (left + right) >> 1, offset);
            if (lans.second != R) { return lans; }
            return self(self, index << 1 | 1, (left + right) >> 1, right, acc(offset, lans.first));
        };
        return prec(prec, 1, 0, half, Monoid::id()).second;
    }
    void debugPrint() const
    {
        std::cerr << "[";
        for (std::size_t i = half; i < half + size; i++) { std::cerr << value[i] << (i + 1 == half + size ? "" : ","); }
        std::cerr << "]\n";
    }

private:
    void up(const std::size_t i) { value[i] = acc(value[i << 1], value[i << 1 | 1]); }
    const std::size_t size, half;
    std::vector<T> value;
    const Monoid acc{};
};
//!============================================!//
//!    8888ba.88ba             oo              !//
//!    88  '8b  '8b                            !//
//!    88   88   88  .d8888b.  dP  88d888b.    !//
//!    88   88   88  88'  '88  88  88'  '88    !//
//!    88   88   88  88.  .88  88  88    88    !//
//!    dP   dP   dP  '88888P8  dP  dP    dP    !//
//!============================================!//
struct Monoid
{
    using T = std::pair<ll, int>;
    T operator()(const T& a, const T& b) const { return std::max(a, b); }
    static constexpr T id() { return T{-1, -1}; }
};

int main()
{
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    int N, M, Q;
    std::cin >> N >> M >> Q;
    Graph g(N);
    Rep(M, [&](const int) {
        int A, B;
        std::cin >> A >> B, A--, B--, g.addEdge(A, B), g.addEdge(B, A);
    });
    BCC bcc(g);
    const auto comp = bcc.getComp();
    auto t = bcc.toTree();
    HLD hld(t);
    std::vector<Monoid::T> v(t.V);
    std::vector<std::priority_queue<ll>> Qs(t.V);
    for (int i = 0; i < t.V; i++) { v[i] = {-1LL, i}, Qs[i].push(-1LL); }
    SegTree<Monoid> seg(v.begin(), v.end());
    Rep(Q, [&](const int) {
        int T;
        std::cin >> T;
        if (T == 1) {
            int U;
            ll W;
            std::cin >> U >> W, U--;
            const std::size_t c = hld.at(comp[U]);
            Qs[c].push(W), seg.set(c, {Qs[c].top(), c});
        } else {
            int S, T;
            std::cin >> S >> T, S--, T--;
            const auto range = hld.path(comp[S], comp[T]);
            Monoid::T max = {-INF<ll>, -1};
            for (const auto& p : range) {
                const auto q = std::minmax(p.first, p.second);
                const std::size_t l = q.first, r = q.second + 1;
                chmax(max, seg.accumulate(l, r));
            }
            if (max.first != -1LL) { Qs[max.second].pop(), seg.set(max.second, {Qs[max.second].top(), max.second}); }
            std::cout << max.first << std::endl;
        }
    });
    return 0;
}