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