#include <bits/stdc++.h>

using namespace std;

#define LL long long
const int N = 1e6 + 10;

int main(){
	LL t; 
	while(t--){
		int n, q;
		string s1, s2; 
		cin >> n >> q;
		cin >> s1 >> s2;
		while(q--){
			if(s1 == s2) puts("Yes");
			else puts("No");
			int o, p; 
			char c;
			cin >> o >> p >> c;
			if(o == 0) s1[p - 1] = c;
			else if(o == 1)s2[p - 1] = c;
		}
	}
	return 0;
}