func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     int n;     cin >> n;     char last, f;     cin >> last;     int ans = 0;     f = last;     for (int i = 1; i < n; i++) {       char a;       cin >> a;       if (a != last) ans++;       last = a;     }     if (f ==  F )       cout <<  NO n ;     else       cout << ((ans & 1) ?  YES n  :  NO n );   }   