#include <iostream>
#include <iomanip>
#include <stack>
#include <queue>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <deque>
#include <set>
#include <map>
#include <bitset>
#include <ctype.h>
#include <numeric>

using namespace std;
using ll = long long;

int main() {
	string a, p, q;
	cin >> a >> p >> q;
	if(p == q) cout << "No" << endl;
	else cout << "Yes" << endl;
}