func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     int c = 0;     int u =  a ;     for (int i = 0; i < s.length(); i++) {       if (c >= 26) break;       if (s[i] <= u) {         s[i] = u;         c++;         u++;         if (u >  z ) break;       }     }     if (c >= 26)       cout << s;     else       cout <<  -1 ;     return 0;   }   