3
6 0 0 0 0 9 0 0 0
0 4 0 0 0 6 0 8 3
0 0 0 5 0 8 0 9 1
0 0 0 0 7 3 0 0 0
3 0 5 0 0 0 4 0 9
0 0 0 4 1 0 0 0 0
1 9 0 2 0 7 0 0 0
2 8 0 3 0 0 0 5 0
0 0 0 8 0 0 0 0 6