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