#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,fma,abm,mmx,avx,avx2")
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for (int i = (int)(n - 1); i >= 0; i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
#define yn(joken) cout<<((joken) ? "Yes" : "No")<<"\n"
#define YN(joken) cout<<((joken) ? "YES" : "NO")<<"\n"
using namespace std;
using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
using vs = vector<string>;
using vc = vector<char>;
using vd = vector<double>;
using vld = vector<long double>;
using vvi = vector<vector<int>>;
using vvl = vector<vector<ll>>;
using vvs = vector<vector<string>>;
using vvc = vector<vector<char>>;
using vvd = vector<vector<double>>;
using vvld = vector<vector<long double>>;
using vvvi = vector<vector<vector<int>>>;
using vvvl = vector<vector<vector<ll>>>;
using vvvvi = vector<vector<vector<vector<int>>>>;
using vvvvl = vector<vector<vector<vector<ll>>>>;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
const int INF = 1e9;
const ll LINF = 2e18;
template <class T>
bool chmax(T& a, const T& b) {
    if (a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T& a, const T& b) {
    if (b < a) {
        a = b;
        return 1;
    }
    return 0;
}
bool ispow2(int i) { return i && (i & -i) == i; }
bool ispow2(ll i) { return i && (i & -i) == i; }
template <class T>
vector<T> make_vec(size_t a) {
    return vector<T>(a);
}
template <class T, class... Ts>
auto make_vec(size_t a, Ts... ts) {
    return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}
template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
    for (int i = 0; i < int(v.size()); i++) {
        is >> v[i];
    }
    return is;
}
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    for (int i = 0; i < int(v.size()); i++) {
        os << v[i];
        if (i < int(v.size()) - 1) os << ' ';
    }
    return os;
}

static uint32_t RandXor(){
    static uint32_t x=123456789;
    static uint32_t y=362436069;
    static uint32_t z=521288629;
    static uint32_t w=88675123;
    uint32_t t;
 
    t=x^(x<<11);
    x=y; y=z; z=w;
    return w=(w^(w>>19))^(t^(t>>8));
}

static long double Rand01(){
    return (RandXor()+0.5)*(1.0/UINT_MAX);
}

template <typename T = int>
struct Edge{
    int from, to;
    T cost;
    int idx;
    Edge() = default;
    Edge(int from, int to, T cost = 1, int idx = -1) : from(from), to(to), cost(cost), idx(idx) {}
    operator int() const { return to; }
};

template <typename T = int>
struct Graph{
    vector<vector<Edge<T>>> g;
    int es;
    Graph() = default;
    explicit Graph(int n) : g(n), es(0) {}
    size_t size() const{
        return g.size();
    }

    void add_directed_edge(int from, int to, T cost = 1){
        g[from].emplace_back(from, to, cost, es++);
    }

    void add_edge(int from, int to, T cost = 1){
        g[from].emplace_back(from, to, cost, es);
        g[to].emplace_back(to, from, cost, es++);
    }

    void read(int M, int padding = -1, bool weighted = false, bool directed = false){
        for (int i = 0; i < M; i++){
            int a, b;
            cin >> a >> b;
            a += padding;
            b += padding;
            T c = T(1);
            if (weighted) cin >> c;
            if (directed) add_directed_edge(a, b, c);
            else add_edge(a, b, c);
        }
    }

    inline vector<Edge<T>> &operator[](const int &k){
        return g[k];
    }

    inline const vector<Edge<T>> &operator[](const int &k) const{
        return g[k];
    }
};

template <typename T = int>
using Edges = vector<Edge<T>>;

template<typename T>
vector<int> bridge_tree_decomposition(Graph<T> &G){
    int N=(int)G.g.size();
    vector<bool> visited(N);
    vector<int> ord(N),low(N),cmp(N,-1);
    int ts=0,idx=0;
    auto dfs=[&](auto &&self,int v,int p=-1)->void{
        visited[v]=true;
        ord[v]=ts;
        low[v]=ord[v];
        ts++;
        bool flg=false;
        for(auto nv:G[v]){
            if(!visited[nv]){
                self(self,nv,v);
                low[v]=min(low[v],low[nv]);
            }
            else if(nv!=p){
                low[v]=min(low[v],ord[nv]);
            }
            else{
                if(!flg) flg=true;
                else low[v]=min(low[v],ord[p]);
            }
        }
    };
    auto dfs2=[&](auto &&self,int v)->void{
        for(auto nv:G[v]){
            if(cmp[nv]!=-1) continue;
            if(low[nv]<=ord[v]) cmp[nv]=cmp[v];
            else{
                cmp[nv]=idx;
                idx++;
            }
            self(self,nv);
        }
    };
    for(int i=0;i<N;i++) if(!visited[i]) dfs(dfs,i);    
    for(int i=0;i<N;i++){
        if(cmp[i]==-1){
            cmp[i]=idx;
            idx++;
            dfs2(dfs2,i);
        }
    }
    return cmp;
}

// HeavyLightDecomposition<Graph<int>> HLD(g,root); などする,rootは指定しない場合0になる
// size: 部分木のサイズ(元の木の頂点番号->サイズ)
// depth: 深さ(元の木の頂点番号->深さ)
// down: 行きがけ順(セグ木上での順番でもある) (元の木の頂点番号->行きがけ順)
// up: 部分木クエリに使うやつ
// nxt: ある頂点が属する連結成分の中で最も浅い頂点(元の木の頂点番号->元の木の頂点番号)
// par: 親の番号(元の木の頂点番号->元の木の頂点番号)
// rev: 行きがけ順から元の木の頂点番号に戻す配列
// void path_query(int u,int v,bool vertex,F f): u,vパスについての可換なクエリを処理,頂点属性ならvertexをtrueにする
// void path_noncommutative_query(int u,int v,bool vertex,F f): u,vパスについての非可換なクエリを処理,頂点属性ならvertexをtrueにする
// void subtree_query(int u,bool vertex,F f): uを根とする部分木についてのクエリを処理
// 上3つではいずれもラムダ式でfを渡せばよく,[l,r)についての結果をどこかにまとめる感じで書くと良い
// その他,汎用的な関数がある(lca,la,dist,in_subtree,move)

template <typename G>
struct HeavyLightDecomposition{
private:
    void dfs_sz(int cur){
        size[cur] = 1;
        for (auto &dst : g[cur]){
            if (dst == par[cur]){
                if (g[cur].size() >= 2 && int(dst) == int(g[cur][0])) swap(g[cur][0], g[cur][1]);
                else continue;
            }
            depth[dst] = depth[cur] + 1;
            par[dst] = cur;
            dfs_sz(dst);
            size[cur] += size[dst];
            if (size[dst] > size[g[cur][0]]) swap(dst, g[cur][0]);
        }
    }

    void dfs_hld(int cur){
        down[cur] = id++;
        rev[down[cur]] = cur;
        for (auto dst : g[cur]){
            if (dst == par[cur]) continue;
            nxt[dst] = (int(dst) == int(g[cur][0]) ? nxt[cur] : int(dst));
            dfs_hld(dst);
        }
        up[cur] = id;
    }

    // [u, v)
    vector<pair<int, int>> ascend(int u, int v) const{
        if(u == v) return {};
        vector<pair<int, int>> res;
        while (nxt[u] != nxt[v]){
            res.emplace_back(down[u], down[nxt[u]]);
            u = par[nxt[u]];
        }
        if (u != v) res.emplace_back(down[u], down[v] + 1);
        return res;
    }

    // (u, v]
    vector<pair<int, int>> descend(int u, int v) const{
        if (u == v) return {};
        if (nxt[u] == nxt[v]) return {{down[u] + 1, down[v]}};
        auto res = descend(u, par[nxt[v]]);
        res.emplace_back(down[nxt[v]], down[v]);
        return res;
    }

public:
    G &g;
    int id;
    vector<int> size, depth, down, up, nxt, par, rev;
    HeavyLightDecomposition(G &_g, int root = 0)
        : g(_g),
          id(0),
          size(g.size(), 0),
          depth(g.size(), 0),
          down(g.size(), -1),
          up(g.size(), -1),
          nxt(g.size(), root),
          par(g.size(), root),
          rev(g.size(), root)
    {
        dfs_sz(root);
        dfs_hld(root);
    }

    void build(int root){
        dfs_sz(root);
        dfs_hld(root);
    }

    pair<int, int> idx(int i) const { return make_pair(down[i], up[i]); }

    template <typename F>
    void path_query(int u, int v, bool vertex, const F &f){
        int l = lca(u, v);
        for (auto &&[a, b] : ascend(u, l)){
            int s = a + 1, t = b;
            s > t ? f(t, s) : f(s, t);
        }
        if (vertex) f(down[l], down[l] + 1);
        for (auto &&[a, b] : descend(l, v)){
            int s = a, t = b + 1;
            s > t ? f(t, s) : f(s, t);
        }
    }

    template <typename F>
    void path_noncommutative_query(int u, int v, bool vertex, const F &f){
        int l = lca(u, v);
        for (auto &&[a, b] : ascend(u, l)) f(a + 1, b);
        if (vertex) f(down[l], down[l] + 1);
        for (auto &&[a, b] : descend(l, v)) f(a, b + 1);
    }

    template <typename F>
    void subtree_query(int u, bool vertex, const F &f){
        f(down[u] + int(!vertex), up[u]);
    }

    int lca(int a, int b){
        while (nxt[a] != nxt[b]){
            if (down[a] < down[b]) swap(a, b);
            a = par[nxt[a]];
        }
        return depth[a] < depth[b] ? a : b;
    }

    int lca(int r, int u, int v){
        return lca(r, u) ^ lca(u, v) ^ lca(v, r);
    }

    int la(int v, int k) {
        while(1){
            int u = nxt[v];
            if(down[v] - k >= down[u]) return rev[down[v] - k];
            k -= down[v] - down[u] + 1;
            v = par[nxt[u]];
        }
    }

    int dist(int a, int b) { return depth[a] + depth[b] - depth[lca(a, b)] * 2; }

    // bがaの部分木内にあるか
    bool in_subtree(int a, int b) { return down[a] <= down[b] && down[b] <= up[a]; }

    // aからbの方向に1進んだ頂点を返す
    int move(int a, int b) {
        assert(a != b);
        if(in_subtree(b,a)){
            return par[a];
        }
        else{
            if(lca(a,b)==a){
                return la(b,dist(a,b)-1);
            }
            else{
                return par[a];
            }
        }
    }

    // s-tパス上にxがあるか
    bool in_path(int s, int t, int x){
        return dist(s, x) + dist(x, t) == dist(s, t);
    }
};

int ceil_pow2(int n) {
    int x = 0;
    while ((1U << x) < (unsigned int)(n)) x++;
    return x;
}

struct segtree{
public:
    segtree() : segtree(0) {}
    segtree(int n) : _n(n) {
        log = ceil_pow2(_n);
        size = 1 << log;
        pq=vector<priority_queue<int>>(size);
        d=vector<pii>(2*size);
        rep(i,_n) d[size+i].second=i;
        rep(i,size) add(i,-1);
    }

    void add(int p,int x){
        pq[p].emplace(x);
        d[p+size].first=pq[p].top();
        p+=size;
        for (int i = 1; i <= log; i++){
            int x=p>>i;
            if(d[2*x].first>=d[2*x+1].first) d[x]=d[2*x];
            else d[x]=d[2*x+1];
        }
    }

    void erase(int p){
        pq[p].pop();
        d[p+size].first=pq[p].top();
        p+=size;
        for (int i = 1; i <= log; i++){
            int x=p>>i;
            if(d[2*x].first>=d[2*x+1].first) d[x]=d[2*x];
            else d[x]=d[2*x+1];
        }
    }

    pii prod(int l, int r){
        assert(0 <= l && l <= r && r <= _n);
        pii ret(-1,-1);
        l += size;
        r += size;

        while (l < r){
            if (l & 1){
                if(ret.first<d[l].first) ret=d[l];
                l++;
            }
            if (r & 1){
                r--;
                if(ret.first<d[r].first) ret=d[r];
            }
            l >>= 1;
            r >>= 1;
        }
        return ret;
    }

private:
    int _n, size, log;
    vector<priority_queue<int>> pq;
    vector<pii> d;
};

void solve(){
    int N,M,Q;
    cin>>N>>M>>Q;
    vi A(M),B(M);
    Graph<int> original_graph(N);
    rep(i,M){
        cin>>A[i]>>B[i];
        A[i]--; B[i]--;
        original_graph.add_edge(A[i],B[i]);
    }
    auto ret=bridge_tree_decomposition(original_graph);
    int X=*max_element(all(ret))+1;
    Graph<int> G(X);
    rep(i,M){
        if(ret[A[i]]!=ret[B[i]]){
            G.add_edge(ret[A[i]],ret[B[i]]);
        }
    }
    HeavyLightDecomposition<Graph<int>> HLD(G,0);
    segtree seg(X);
    while(Q--){
        int t;
        cin>>t;
        if(t==1){
            int u,w;
            cin>>u>>w;
            u--;
            seg.add(ret[u],w);
        }
        else{
            int s,t;
            cin>>s>>t;
            s--; t--;
            s=ret[s]; t=ret[t];
            pii tmp(-1,-1);
            auto f=[&](int l,int r)->void{
                auto x=seg.prod(l,r);
                if(x.first>tmp.first) tmp=x;
            };
            HLD.path_query(s,t,true,f);
            cout<<tmp.first<<"\n";
            if(tmp.first!=-1) seg.erase(tmp.second);
        }
    }
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();
}