20 20
1 12
20 15
-1   -1   -1   -1   -1   -1   -1   -1   -1   -1   -1   0   -1   -1   -1   -1   -1   -1   -1   -1
-1   0   0   0   0   0   0   0   0   0   -1   0   0   0   0   0   0   0   0   -1
-1   -1   -1   0   -1   -1   -1   -1   -1   0   -1   -1   -1   0   -1   -1   -1   -1   0   -1
-1   0   0   0   -1   0   0   0   -1   0   -1   0   -1   0   -1   0   0   -1   0   -1
-1   0   -1   0   -1   0   -1   -1   -1   0   -1   0   -1   0   -1   0   -1   -1   0   -1
-1   0   -1   0   -1   0   0   0   0   0   -1   0   -1   0   -1   0   0   0   0   -1
-1   0   -1   0   -1   -1   0   -1   0   -1   -1   0   -1   0   -1   -1   0   -1   0   -1
-1   0   -1   0   0   -1   -1   -1   -1   -1   -1   0   -1   0   0   -1   -1   -1   -1   -1
-1   0   -1   -1   0   0   0   0   0   0   -1   0   -1   -1   0   0   0   0   0   -1
-1   0   0   -1   -1   -1   -1   -1   -1   0   -1   0   0   -1   -1   -1   -1   -1   0   -1
-1   -1   0   0   -1   0   0   -1   0   0   -1   -1   0   0   -1   0   0   -1   0   -1
-1   -1   -1   0   -1   -1   0   0   0   0   -1   -1   -1   0   -1   -1   0   0   0   -1
-1   0   -1   0   -1   -1   -1   -1   -1   0   -1   0   -1   0   -1   -1   -1   -1   0   -1
-1   0   0   0   -1   0   0   -1   0   0   -1   0   0   0   -1   0   0   -1   0   -1
-1   0   -1   0   -1   0   -1   -1   -1   0   -1   0   -1   0   -1   0   -1   -1   0   -1
-1   0   -1   0   -1   0   0   0   0   0   -1   0   -1   0   -1   0   0   0   0   -1
-1   0   -1   0   -1   -1   0   -1   0   -1   -1   0   -1   0   -1   -1   0   -1   0   -1
-1   0   -1   0   0   -1   -1   -1   -1   -1   0   0   -1   0   0   -1   -1   -1   0   -1
-1   0   -1   -1   0   0   0   0   0   0   0   -1   -1   -1   0   0   0   0   0   -1
-1   -1   -1   -1   -1   -1   -1   -1   -1   -1   -1   -1   -1   -1   0   -1   -1   -1   -1   -1