func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     int n = s.size();     int i = 0;     while (i < n and s[i] ==  a ) i++;     int j = i + 1;     while (j < n and s[j] !=  a ) j++;     if (i == n)       s[n - 1] =  z ;     else       for (int k = i; k < j; k++) s[k] = (s[k] -  a  - 1 + 26) % 26 +  a ;     cout << s << endl;     return 0;   }   