3
0  0 -1 -1  0 -1  0
0  0 -1  0 -1 -1  0
0 -1 -1  0  0 -1 -1
0
3 3 2
-1 -1  0
 0 -1 -1
 0 -1  0
0 -1 -1  0  0 -1 -1 1
0  0 -1  0 -1 -1  0 1
0  0 -1 -1  0 -1  0 1
