#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using Modint = atcoder::static_modint<998244353>;
using namespace std;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;


void testcase(){
    string A,P,Q; cin >> A >> P >> Q;
    if(P == Q) cout << "No\n"; else cout << "Yes\n";
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    testcase();
    return 0;
}