Sudoku

#include <iostream>
#include <cmath>

using namespace std;

int main(int argc, char** argv) {
    string a;
    cin >> a;
    for (int l = 0; l < 3; ++l){
        for (int j = 0; j < 3; ++j){
            for (int k = 0; k < 3; ++k){
                for (int i = 0; i < 3; ++i){
                    cout << a[((i+l)%3+3*k+3*j)%9];
                }
            }
            cout << "\n";
        }  
    }
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED