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