#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
	int g, b;
	cin >> b >> g;
	string S;
	cin >> S;
	while (b--) {
		int a;
		cin >> a;
		if (a==1) {
			int y;
			char z;
			cin >> y >> z;
			S[y-1] = z;
		}
		else {
			string sar;
			cin >> sar;
			vector<bool> v(sar.size()+1, false);
			v[0] = true;
			for (int i = 0; i < S.size(); i++) {
				char s = S[i];
				for (int k = 0; k < sar.size(); k++) {
					if (s == sar[k]) {
						if (v[k]) {
							v[k+1] = true;
						}
					}
					if (v[sar.size()]) break;
				}
			}
			if (v[sar.size()]) cout << "Yes" << endl;
			else cout << "No" << endl;
		}
	}
}