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