#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/extc++.h>
using namespace std;
using ld = long double; 
const vector<int> dx = {0, 0, 1, -1,1,-1,-1,1};
const vector<int> dy = {1, -1, 0, 0,1,-1,1,-1};
#define vec vector
#define int long long
#define double long double
//cout<<setprecision(10)<<fixed<<..
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repp(i, x, n) for (int i = x; i < (int)(n); i++)
#define pii pair<int,int>
#define pq priority_queue

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    string a,p,q;
    cin>>a>>p>>q;
    cout<<(p!=q?"Yes\n":"No\n");

}