func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int T;     cin >> T;     while (T--) {       string s[9];       for (long long int i = 0; i < 9; i++) {         cin >> s[i];       }       for (long long int i = 0; i < 9; i++) {         for (long long int j = 0; j < 9; j++) {           if (s[i][j] ==  3 ) s[i][j] =  1 ;         }       }       for (long long int i = 0; i < 9; i++) {         cout << s[i] <<   n ;       }     }     return 0;   }   