func_code_string: #include <bits/stdc++.h>   using namespace std;   int A[26];   int main() {     int n;     cin >> n;     string s;     cin >> s;     int cnt = 0;     for (int i = 0; i < n; i++) s[i] = tolower(s[i]);     for (int i = 0; i < n; i++) {       if (!A[s[i] -  a ]) {         A[s[i] -  a ] = 1;         ++cnt;       }     }     if (cnt == 26)       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   