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