#include "bits/stdc++.h"

using namespace std;

using ll=long long;

void solve(){
    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);
    int t=1;
//    cin>>t;
    while(t--){
        solve();
    }
}