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