#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <iostream>
#include <string>
#include <set>
#include <map>
#include <vector>
#include <queue>
#define ll long long
#define db double
using namespace std;
const ll N = 1e5 + 100;
ll tt;
char a[N],p[N],q[N];
void solve() {
	scanf("%s",a + 1);
	scanf("%s",p + 1);
	scanf("%s",q + 1);
	bool ans = 1;
	ll n = strlen(p + 1);
	ll m = strlen(q + 1);
	if (n != m) {
		ans = 0;
	} else {
		for (ll i = 1;i <= n;i++) {
			if (p[i] != q[i]) {
				ans = 0;
				break;
			}
		}
	}
	if (ans) {
		printf("No\n");
	} else {
		printf("Yes\n");
	}
}
int main() {
	tt = 1;
	while(tt) {
		solve();
		tt--;
	}
	return 0;
}