#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N,Q; cin >> N >> Q;
    vector<set<int>> ap(26);
    string s; cin >> s;
    for(int i=0; i<N; i++) ap.at(s.at(i)-'a').insert(i);
    while(Q--){
        int type; cin >> type;
        if(type == 1){
            int pos; char c; cin >> pos >> c,pos--;
            ap.at(s.at(pos)-'a').erase(pos);
            s.at(pos) = c;
            ap.at(s.at(pos)-'a').insert(pos);
        }
        else{
            string t; cin >> t;
            int pos = 0;
            for(auto c : t){
                int v = c-'a';
                auto itr = ap.at(v).lower_bound(pos);
                if(itr == ap.at(v).end()){pos = N+1; break;}
                pos = *itr,pos++;
            }

            if(pos <= N) cout << "Yes\n";
            else cout << "No\n";
        }
    }
}