12 4
2  1  1  0 -1
3  1 -1  1  0
4
5-1
6
78 7
8  1  0  1  0 -1  0  0
9  1  0 -1  0  1  0  0
10  1  1  0  0  0 -1  0
11  1 -1  0  0  0  1  0
12  1  0  1  0  0  0 -1
13  1  0 -1  0  0  1  0
14  1  0 -1  1  0  0 -1
15  1  0  0 -1  0  1  0
16