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