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