func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int i, n;     cin >> n;     char a[n];     for (i = 0; i <= n - 1; i++) {       cin >> a[i];     }     if (a[0] ==  S  && a[n - 1] ==  F )       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   