#include <bits/stdc++.h>
using namespace std;
#define all(p) p.begin(), p.end()
int main(){
    int N;
    cin >> N;
    string S;
    cin >> S;
    sort(all(S));
    cout << (N % 2 == 0 && S[N / 2] != S[N / 2 - 1] ? "Yes\n" : "No\n");
}