#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,n)  for(int i=0; i<n; i++)
#define vi vector<int>//リスト
#define vvi vector<vector<int>>//2次元配列
#define sr(a) sort(a.begin(),a.end())//小さい順に
#define rev(a) reverse(a.begin(),a.end())//順序を逆に
#define coudo(n,x) cout<<fixed<<setprecision(n)<<x;//xを小数点以下n桁表示

int main(){
	ll n,q;cin>>n>>q;
	string s;cin>>s;
	ll tipe,qi;char qs;
	string t;
	ll f,ok;
	rep(i,q){
		cin>>tipe;
		if(tipe==1){
			cin>>qi>>qs;
			s[qi-1]=qs;
		}
		else{
			f=0;
			cin>>t;
			rep(l,t.size()){
				ok=0;
				rep(j,n){
					if(s[j]==t[l]){
						ok=1;
					}
				}
				if(ok==0){
					f=1;
				}
			}
			if(f==0){
				cout<<"Yes"<<endl;
			}
			else{
				cout<<"No"<<endl;
			}
		}
	}
}