#define LOCAL
#include <bits/stdc++.h>
using namespace std;
#pragma region Macros
typedef long long ll;
typedef __int128_t i128;
typedef unsigned int uint;
typedef unsigned long long ull;
#define ALL(x) (x).begin(), (x).end()

template <typename T> istream& operator>>(istream& is, vector<T>& v) {
    for (T& x : v) is >> x;
    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] << (i + 1 == (int)v.size() ? "" : " ");
    }
    return os;
}
template <typename T, typename U> ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << '(' << p.first << ',' << p.second << ')';
    return os;
}
template <typename T, typename U, typename V> ostream& operator<<(ostream& os, const tuple<T, U, V>& t) {
    os << '(' << get<0>(t) << ',' << get<1>(t) << ',' << get<2>(t) << ')';
    return os;
}
template <typename T, typename U, typename V, typename W> ostream& operator<<(ostream& os, const tuple<T, U, V, W>& t) {
    os << '(' << get<0>(t) << ',' << get<1>(t) << ',' << get<2>(t) << ',' << get<3>(t) << ')';
    return os;
}
template <typename T, typename U> ostream& operator<<(ostream& os, const map<T, U>& m) {
    os << '{';
    for (auto itr = m.begin(); itr != m.end();) {
        os << '(' << itr->first << ',' << itr->second << ')';
        if (++itr != m.end()) os << ',';
    }
    os << '}';
    return os;
}
template <typename T, typename U> ostream& operator<<(ostream& os, const unordered_map<T, U>& m) {
    os << '{';
    for (auto itr = m.begin(); itr != m.end();) {
        os << '(' << itr->first << ',' << itr->second << ')';
        if (++itr != m.end()) os << ',';
    }
    os << '}';
    return os;
}
template <typename T> ostream& operator<<(ostream& os, const set<T>& s) {
    os << '{';
    for (auto itr = s.begin(); itr != s.end();) {
        os << *itr;
        if (++itr != s.end()) os << ',';
    }
    os << '}';
    return os;
}
template <typename T> ostream& operator<<(ostream& os, const multiset<T>& s) {
    os << '{';
    for (auto itr = s.begin(); itr != s.end();) {
        os << *itr;
        if (++itr != s.end()) os << ',';
    }
    os << '}';
    return os;
}
template <typename T> ostream& operator<<(ostream& os, const unordered_set<T>& s) {
    os << '{';
    for (auto itr = s.begin(); itr != s.end();) {
        os << *itr;
        if (++itr != s.end()) os << ',';
    }
    os << '}';
    return os;
}
template <typename T> ostream& operator<<(ostream& os, const deque<T>& v) {
    for (int i = 0; i < (int)v.size(); i++) {
        os << v[i] << (i + 1 == (int)v.size() ? "" : " ");
    }
    return os;
}

void debug_out() { cerr << '\n'; }
template <class Head, class... Tail> void debug_out(Head&& head, Tail&&... tail) {
    cerr << head;
    if (sizeof...(Tail) > 0) cerr << ", ";
    debug_out(move(tail)...);
}
#ifdef LOCAL
#define debug(...)                                                                   \
    cerr << " ";                                                                     \
    cerr << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << '\n'; \
    cerr << " ";                                                                     \
    debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

template <typename T> T gcd(T x, T y) { return y != 0 ? gcd(y, x % y) : x; }
template <typename T> T lcm(T x, T y) { return x / gcd(x, y) * y; }

template <class T1, class T2> inline bool chmin(T1& a, T2 b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template <class T1, class T2> inline bool chmax(T1& a, T2 b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
#pragma endregion

const int INF = 1e9;
const long long IINF = 1e18;
const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
const char dir[4] = {'D', 'R', 'U', 'L'};
const long long MOD = 1000000007;
// const long long MOD = 998244353;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    string S;
    cin >> N >> S;
    vector<vector<pair<int, char>>> G(N);
    for (int i = 0; i < N - 1; i++) {
        int u, v;
        char c;
        cin >> u >> v >> c;
        u--, v--;
        G[u].emplace_back(v, c);
        G[v].emplace_back(u, c);
    }

    int sz = S.size(), ans = 0;
    string T = S;
    reverse(T.begin(), T.end());
    vector<vector<int>> dp1(N, vector<int>(sz + 1, 0)),
        dp2(N,
            vector<int>(sz + 1,
                        0));  // vの部分木内のある頂点からvの親頂点に進む際のSの先頭i文字(もしくはその逆)とのLCSの大きさ
    auto dfs = [&](auto self, int v, int p) -> void {
        vector<int> Max1(sz + 1, 0), Max2(sz + 1, 0);
        for (auto& e : G[v]) {
            int u = e.first;
            if (u == p) continue;
            self(self, u, v);
            for (int i = sz - 1; i >= 0; i--) {
                dp1[u][i + 1] = max(dp1[u][i + 1], dp1[u][i] + (S[i] == e.second));
                dp2[u][i + 1] = max(dp2[u][i + 1], dp2[u][i] + (T[i] == e.second));
            }
            for (int i = 0; i <= sz; i++) {
                dp1[v][i] = max(dp1[v][i], dp1[u][i]);
                dp2[v][i] = max(dp2[v][i], dp2[u][i]);
            }
            for (int i = 0; i <= sz; i++) {
                ans = max(ans, dp1[u][i] + Max2[sz - i]);
                ans = max(ans, dp2[u][i] + Max1[sz - i]);
            }
            for (int i = 0; i <= sz; i++) {
                Max1[i] = max(Max1[i], dp1[u][i]);
                Max2[i] = max(Max2[i], dp2[u][i]);
            }
        }
    };

    dfs(dfs, 0, -1);
    cout << ans << '\n';
    return 0;
}