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