func_code_string: #include <bits/stdc++.h>   using namespace std;   string a;   int main() {     cin >> a;     if (a == string(a.size(),  a )) {       cout << string(a.size() - 1,  a ) <<  z  << endl;     } else {       for (int i = 0; i < a.size(); i++) {         if (a[i] !=  a ) {           int x = i;           while (x < a.size() && a[x] !=  a ) {             a[x++]--;           }           break;         }       }       cout << a << endl;     }     return 0;   }   