#include "bits/stdc++.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

// clang-format off
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

using ll = long long;
typedef cc_hash_table<ll, ll, hash<ll>> ht;

using str = string;
using AR2 = array<int, 2>;
template <class T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <class T> using vec = vector<T>;
template <class T> using vvec = vec<vec<T>>;
template <class T> using vvvec = vec<vvec<T>>;
template <class T, size_t SZ> using vac = vec<array<T, SZ>>;
template <class T, size_t SZ> using vvac = vec<vac<T, SZ>>;
template <class T> using pqueue = priority_queue<T, vec<T>>;
template <class T> using pqueue_min = priority_queue<T, vec<T>, greater<T>>;
 
 
#define sz(x) int((x).size())
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sor(x) sort(all(x))
#define pb push_back
 
#define F_OR(i, a, b, s) for (int i=(a); (s)>0?i<(int)(b):i>(int)(b); i+=(s))
#define F_OR1(e) F_OR(i, 0, e, 1)
#define F_OR2(i, e) F_OR(i, 0, e, 1)
#define F_OR3(i, b, e) F_OR(i, b, e, 1)
#define F_OR4(i, b, e, s) F_OR(i, b, e, s)
#define GET5(a, b, c, d, e, ...) e
#define F_ORC(...) GET5(__VA_ARGS__, F_OR4, F_OR3, F_OR2, F_OR1)
#define FOR(...) F_ORC(__VA_ARGS__)(__VA_ARGS__)
#define E_ACH2(x, a) for (auto& x: a)
#define E_ACH3(x, y, a) for (auto& [x, y]: a)
#define E_ACH4(x, y, z, a) for (auto& [x, y, z]: a)
#define E_ACHC(...) GET5(__VA_ARGS__, E_ACH4, E_ACH3, E_ACH2)
#define EACH(...) E_ACHC(__VA_ARGS__)(__VA_ARGS__)
#define SUBMASKS(t, s) for (ll t = (s); t >= 0; t = (t == 0 ? -1 : (t - 1) & (s)))
#define MIN(v) *min_element(all(v))
#define MAX(v) *max_element(all(v))
#define SUM(v) accumulate(all(x), 0);

constexpr int popcount(int x) { return __builtin_popcount(x); }
constexpr int bitlength(int x) { return x == 0 ? 0 : 31 - __builtin_clz(x); }
ll cdiv(ll a, ll b) { return a/b + ((a^b) > 0 && a % b); };
ll fdiv(ll a, ll b) { return a/b - ((a^b) < 0 && a % b); };
template <class T> T pop(vec<T> &v) { T x = v.back(); v.pop_back(); return x; }
template <class T> bool bounds(T a, T lo, T hi) { return lo <= a && a <= hi; }
template <class T> T truemod(T x, T M) { return (x % M + M) % M; }
template <class T> bool umin(T &a, const T &b) { return b < a ? a = b, 1 : 0; }
template <class T> bool umax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }
template <class T> int lwb(vec<T> &a,  T &b) { return int(lower_bound(all(a), b) - begin(a)); }
template <class T> int upb(vec<T> &a,  T &b) { return int(upper_bound(all(a), b) - begin(a)); }
template <class T> void removeDupes(vec<T> &v) { sort(all(v)); v.erase(unique(all(v)), end(v)); }
template <class T, class U> void eraseOne(T &t,  U &u) { auto it = t.find(u); assert(it != end(t)); t.erase(it); }
template <class T, class U> T firstTrue(T lo, T hi, U f) {
    ++hi; assert(lo <= hi);
    while (lo < hi) {
        T mi = lo + (hi-lo) / 2;
        f(mi) ? hi = mi : lo = mi + 1;
    }
    return lo;
}
template <class T, class U> T lastTrue(T lo, T hi, U f) {
    --lo; assert(lo <= hi);
    while (lo < hi) {
        T mi = lo + (hi-lo+1) / 2;
        f(mi) ? lo = mi : hi = mi - 1;
    }
    return lo;
}
 
template <class T, size_t SZ> istream &operator>>(istream &s, array<T, SZ>& v) { FOR(sz(v)) s >> v[i]; return s; }
template <class T> istream &operator>>(istream &s, vec<T>& v) { FOR(sz(v)) s >> v[i]; return s; }
template <class T> ostream &operator<<(ostream &s, vec<T>& v) { FOR(sz(v)) s << (i?" ":"") << v[i]; return s; }
template <class T> ostream &operator<<(ostream &s, const vec<T>& v) { FOR(sz(v)) s << (i?" ":"") << v[i]; return s; }
 
template<class A> void write(A x) { cout << x; }
template<class H, class... T> void write(const H& h, const T&... t) { 
  write(h); write(t...); }
void print() { write("\n"); }
template<class H, class... T> void print(const H& h, const T&... t) { 
  write(h); if (sizeof...(t)) write(" "); print(t...); }
 
void decrement() {}
template <class T, size_t SZ> void decrement(vec<array<T, SZ>> &v) { EACH(row, v) EACH(x, row) --x; }
template <class T> void decrement(vec<vec<T>> &v) { EACH(row, v) EACH(x, row) --x; }
template <class T> void decrement(vec<T> &v) { EACH(x, v) --x; }
template <class T, class... U> void decrement(T &t, U &...u) { --t; decrement(u...); }
 
template <class T> void read(T& x) { cin >> x; }
template<class T, class... U> void read(T &t, U &...u) { read(t); read(u...); }
#define ints(...) int __VA_ARGS__; read(__VA_ARGS__);
#define int1(...) ints(__VA_ARGS__); decrement(__VA_ARGS__);
#define jnts(...) ll __VA_ARGS__; read(__VA_ARGS__);
#define vint(n, a) int n; cin >> n; vec<int> a(n); cin >> a;
#define vin(n, a) vec<int> a((n)); cin >> a;
#define vjn(n, a) vec<ll> a((n)); cin >> a;
#define vvin(n, m, a) vec<vec<int>> a((n), vec<int>((m))); cin >> a;
#define vain(n, m, a) vec<array<int, (m)>> a((n)); cin >> a;
#define graphin(n, m, adj) vvec<int> adj(n); FOR(m) {int1(u, v); adj[u].pb(v); adj[v].pb(u); }
#define lgraphin(n, m, adj) vvac<int, 2> adj(n); FOR(i, m) {int1(u, v); adj[u].pb({v,i}); adj[v].pb({u,i}); }
#define wgraphin(n, m, adj) vvac<int, 2> adj(n); FOR(m) {int1(u, v); ints(w); adj[u].pb({v,w}); adj[v].pb({u,w}); }
#define dgraphin(n, m, adj) vvec<int> adj(n); FOR(m) {int1(u, v); adj[u].pb(v);}
#define dwgraphin(n, m, adj) vvac<int, 2> adj(n); FOR(m) {int1(u, v, w); adj[u].pb({v, w+1});}

// clang-format off
template<ll M>
struct modint {

    static ll _pow(ll n, ll k) {
        ll r = 1;
        for (; k > 0; k >>= 1, n = (n*n)%M)
            if (k&1) r = (r*n)%M;
        return r;
    }

    ll v; modint(ll n = 0) : v(n%M) { v += (M&(0-(v<0))); }
    
    friend string to_string(const modint n) { return to_string(n.v); }
    friend istream& operator>>(istream& i, modint& n) { return i >> n.v; }
    friend ostream& operator<<(ostream& o, const modint n) { return o << n.v; }
    template<typename T> explicit operator T() { return T(v); }

    friend bool operator==(const modint n, const modint m) { return n.v == m.v; }
    friend bool operator!=(const modint n, const modint m) { return n.v != m.v; }
    friend bool operator<(const modint n, const modint m) { return n.v < m.v; }
    friend bool operator<=(const modint n, const modint m) { return n.v <= m.v; }
    friend bool operator>(const modint n, const modint m) { return n.v > m.v; }
    friend bool operator>=(const modint n, const modint m) { return n.v >= m.v; }

    modint& operator+=(const modint n) { v += n.v; v -= (M&(0-(v>=M))); return *this; }
    modint& operator-=(const modint n) { v -= n.v; v += (M&(0-(v<0))); return *this; }
    modint& operator*=(const modint n) { v = (v*n.v)%M; return *this; }
    modint& operator/=(const modint n) { v = (v*_pow(n.v, M-2))%M; return *this; }
    friend modint operator+(const modint n, const modint m) { return modint(n) += m; }
    friend modint operator-(const modint n, const modint m) { return modint(n) -= m; }
    friend modint operator*(const modint n, const modint m) { return modint(n) *= m; }
    friend modint operator/(const modint n, const modint m) { return modint(n) /= m; }
    modint& operator++() { return *this += 1; }
    modint& operator--() { return *this -= 1; }
    modint operator++(int) { modint t = *this; return *this += 1, t; }
    modint operator--(int) { modint t = *this; return *this -= 1, t; }
    modint operator+() { return *this; }
    modint operator-() { return modint(0) -= *this; }

    // O(logk) modular exponentiation
    modint pow(const ll k) const {
        return k < 0 ? _pow(v, M-1-(-k%(M-1))) : _pow(v, k);
    }
    modint inv() const { return _pow(v, M-2); }
};

const ll MOD = 1e9 + 7;
using mint = modint<MOD>;

// clang-format on

const int MX = 1001;
const mint P = 37;
vec<mint> pwr(MX);

void precompute() {
    pwr[0] = 1;
    FOR(i, 1, MX) pwr[i] = pwr[i - 1] * P;
}
void solve() {
    ints(N);
    str S;
    cin >> S;
    graphin(N, N - 1, adj);

    int cur_ans = 0;
    function<void(int, int, int, mint, mint)> dfs = [&](int u, int p, int length, mint fow, mint rev) {
        fow += pwr[length - 1] * S[u];
        rev = rev * P + S[u];
        if (fow == rev)
            umax(cur_ans, length);
        EACH(v, adj[u]) if (v != p) { dfs(v, u, length + 1, fow, rev); }
    };

    ints(Q);
    FOR(Q) {
        int1(index);
        cin >> S[index];
        cur_ans = 0;
        dfs(0, 0, 1, 0, 0);
        print(cur_ans);
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    precompute();

    int T = 1;
    // ints(T);
    FOR(tc, T) { solve(); }
    return 0;
}