func_code_string: #include <bits/stdc++.h>   using namespace std;   bool valid(char str[]) {     int now = 0;     for (int i = 0; str[i]; i++) {       if (str[i] > now +  a ) return false;       if (str[i] == now +  a ) now++;     }     return true;   }   int main() {     char in[550];     scanf( %s , in);     int mx = 0;     for (int i = 0; in[i]; i++) mx = max(mx, in[i] -  a );     int cnt = 0;     if (valid(in))       printf( YES );     else       printf( NO );   }   