#include <bits/stdc++.h>
using namespace std;
#ifdef KURUMI
#include "algo/debug.h"
#endif
#define int long long
#define endl '\n'
#define fi first
#define se second
#define sz(v) (int)v.size()
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())
#define dbg(x) "[" #x << " = " << x << "]"
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template<typename T1, typename T2> T2 rand(T1 l, T2 r) {
return uniform_int_distribution<T2>(l, r)(rng);
}
template<typename T1, typename T2> T2 wrand(T1 l, T2 r, int seed) {
if(seed == 0) return rand(l, r);
else return (seed > 0 ? max(rand(l, r), wrand(l, r, seed - 1)) : min(rand(l, r), wrand(l, r, seed + 1)));
}
template<typename T> bool maximize(T &a, T b) {
if(a < b) {
a = b;
return true;
}else return false;
}
template<typename T> bool minimize(T &a, T b) {
if(a > b) {
a = b;
return true;
}else return false;
}
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> tp3;
const int N = 5e4 + 3;
int n;
int a[N];
string s;
vector<int> adj[N];
void input() {
cin >> n >> s;
s = '.' + s;
for(int i = 1; i <= n; i++) {
a[i] = s[i] - 'a' + 1;
}
for(int i = 1; i < n; i++) {
int u, v; cin >> u >> v;
adj[u].push_back(v);
adj[v].push_back(u);
}
}
namespace Modulo {
const int MOD = (119 << 23) + 1;
const int base = 31;
int pwr[N];
int add(int x, int y) {
return x + y >= MOD ? x + y - MOD : x + y;
}
int sub(int x, int y) {
return x - y < 0 ? x - y + MOD : x - y;
}
int prod(int x, int y) {
return 1LL * x * y % MOD;
}
int gen_hash(string s) {
int tot = 0;
for(char c : s) tot = add(prod(tot, base), c - 'a' + 1);
return tot;
}
}
using namespace Modulo;
namespace Centroid {
int deepest;
int siz[N];
bool passed[N];
unordered_map<int, bool> exist[N];
void dfs_size(int u, int p) {
siz[u] = 1;
for(int v : adj[u]) {
if(v == p || passed[v]) continue;
dfs_size(v, u);
siz[u] += siz[v];
}
}
int find_centroid(int u, int p, int tar) {
for(int v : adj[u]) {
if(v == p || passed[v]) continue;
if(siz[v] * 2 > tar) return find_centroid(v, u, tar);
}
return u;
}
bool dfs_get(int u, int p, int up, int down, int dep, int k) {
if(dep > k) return false;
maximize(deepest, dep);
int represent = sub(prod(up, pwr[k - dep]), down);
if(exist[k - dep][represent]) return true;
for(int v : adj[u]) {
if(v == p || passed[v]) continue;
if(dfs_get(v, u, add(prod(a[v], pwr[dep]), up), add(prod(down, base), a[v]), dep + 1, k)) return true;
}
return false;
}
void dfs_add(int u, int p, int up, int down, int dep, int k) {
if(dep > k) return;
maximize(deepest, dep);
int represent = sub(prod(up, pwr[k - dep]), down);
exist[dep][represent] = true;
for(int v : adj[u]) {
if(v == p || passed[v]) continue;
dfs_add(v, u, add(prod(a[v], pwr[dep]), up), add(prod(down, base), a[v]), dep + 1, k);
}
}
bool decompose(int u, int k) {
dfs_size(u, -1);
u = find_centroid(u, -1, siz[u]);
deepest = 1;
exist[1][sub(prod(a[u], pwr[k - 1]), a[u])] = true;
for(int v : adj[u]) {
if(passed[v]) continue;
if(dfs_get(v, u, a[v], a[v], 1, k)) return true;
dfs_add(v, u, add(prod(base, a[v]), a[u]), add(prod(base, a[u]), a[v]), 2, k);
}
for(int i = 1; i <= deepest; i++) exist[i].clear();
passed[u] = true;
for(int v : adj[u]) {
if(passed[v]) continue;
if(decompose(v, k)) return true;
}
return false;
}
}
using namespace Centroid;
bool trial(int k) {
if(k == 1) return true;
for(int i = 1; i <= n; i++) {
passed[i] = false;
exist[i].clear();
}
return decompose(1, k);
}
void process() {
pwr[0] = 1;
for(int i = 1; i <= n; i++) {
pwr[i] = prod(pwr[i - 1], base);
}
vector<int> odd, even;
for(int i = 1; i <= n; i++) {
(i & 1 ? odd.push_back(i) : even.push_back(i));
}
int l = 0, r = sz(odd) - 1, answer = 0;
while(l <= r) {
int mid = (l + r) >> 1;
if(trial(odd[mid])) maximize(answer, odd[mid]), l = mid + 1;
else r = mid - 1;
}
l = 0, r = sz(even) - 1;
while(l <= r) {
int mid = (l + r) >> 1;
if(trial(even[mid])) maximize(answer, even[mid]), l = mid + 1;
else r = mid - 1;
}
cout << answer << endl;
}
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
#define task "Deeto"
if(fopen(task".inp", "r")) {
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
int testcase = 1; // cin >> testcase;
for(int i = 1; i <= testcase; i++) {
input();
process();
}
cerr << "Saa, watashtachi no deeto hajimemashou" << endl;
cerr << "Atarashii kiseki wo koko kara hajimeru shining place nee mou ichido kimi to..." << endl;
return 0;
}
/*
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*/
