/*
 *   Copyright (c) 2024 Emon Thakur
 *   All rights reserved.
 */
#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define ld long double
#define MOD 1000000007
#define pie 2*(acos(0.0))
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define pb push_back
#define endl '\n'
#define lcm(a,b) (a*b)/(__gcd<ll>(a,b))
#define print(v) for(auto e:v) cout<<e<<" "; cout<<endl;
#define printp(v) for(auto e:v) cout<<e.first<<" "<<e.second<<endl;
#define srt(v) sort(v.begin(),v.end())
#define rsrt(v) sort(v.rbegin(),v.rend())
#define life_is_a_race ios::sync_with_stdio(false); cin.tie(nullptr);

vector<int> g[100005];
int first[100005],last[100005],ind=0;
vector<vector<int>> sg(800010,vector<int>(26));
vector<int> vis;
char s[100005];

void eulertour(int node,int par)
{
    first[node]=ind;
    vis.push_back(node);
    ++ind;
    for(auto e:g[node])
    {
        if(e == par) continue;
        eulertour(e,node);
    }
    last[node]=ind;
    vis.push_back(node);
    ++ind;
}

void buildsg(int node,int start,int end)
{
    if(start == end)
    {
        if(first[vis[start]] == start) sg[node][s[vis[start]]-'a']++;
        return;
    }
    int mid = (start+end)/2;
    buildsg(node*2,start,mid);
    buildsg(node*2+1,mid+1,end);
    for(int i=0;i<26;i++) sg[node][i] = sg[node*2][i]+sg[node*2+1][i];
}

void update(int node,int start,int end,int ind,int i,int j)
{
    if(start == end)
    {
        sg[node][i] ++;
        sg[node][j] --;
        return;
    }
    int mid = (start+end)/2;
    if(ind<=mid) update(node*2,start,mid,ind,i,j);
    else update(node*2+1,mid+1,end,ind,i,j);
    for(int k=0;k<26;k++) sg[node][k] = sg[node*2][k]+sg[node*2+1][k];
}

vector<int> query(int node,int start,int end,int l,int r)
{
    if(l>end || r<start)
    {
        vector<int>v(26,0);
        return v;
    }
    if(l<=start && r>=end) return sg[node];
    int mid = (start+end)/2;
    vector<int> a = query(node*2,start,mid,l,r);
    vector<int> b = query(node*2+1,mid+1,end,l,r);
    for(int i=0;i<26;i++) a[i] += b[i];
    return a;
}


void solve(int tc)
{
    //cout<<"Case "<<tc<<": ";
    int n,u,v; cin >> n;
    for(int i=1;i<=n;i++) cin >> s[i];
    for(int i=0;i<n-1;i++)
    {
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    eulertour(1,0);
    int m = vis.size();
    buildsg(1,0,m-1);

    int type,node,q,cnt;
    char c;
    cin >> q; while(q--)
    {
        cin >> type;
        if(type==1)
        {
            cin >> node >> c;
            update(1,0,m-1,first[node],c-'a',s[node]-'a');
            s[node] = c;
        }
        else
        {
            cin >> node;
            vector<int> v = query(1,0,m-1,first[node],last[node]-1);
            c = 'z'; cnt = 0;
            for(int i=25;i>=0;i--)
            {
                if(v[i]>=cnt)
                {
                    cnt = v[i];
                    c = 'a'+i;
                }
            }
            cout << c << endl;
        }
    }
}
int main()
{
    life_is_a_race
    int t=1; 
    //cin>>t;
    for(int i=1;i<=t;i++) solve(i);
}