#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll mod=998244353;
ll inf=10000000000000;//10^17
int main(){
    ll a;
    string p,q;
    cin >> a >> p >> q;
    if (p!=q)
    {
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
    
}