func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string str;     cin >> str;     if (str[0] >  4  && str[0] !=  9 ) str[0] = (char)( 9  - str[0] +  0 );     for (int x = 1; x < (int)str.length(); x++)       if (str[x] >  4 ) str[x] = (char)( 9  - str[x] +  0 );     cout << str << endl;     return 0;   }   