t 2 0
check 0 0
t 2 0
check 2 0
check!!1
t 1 1
check 1 1
check!!0
t 4 3
check 0 0
t 4 3
check 2 0
t 4 3
check 2 3
t 4 3
check 4 3
check!!3
t 3 1
check 4 3
t 3 1
check 2 3
t 3 1
check 2 1
t 3 1
check 3 1
check!!3
t 3 1
check 1 3
t 1 1
check 5 2
1
0
3
3
-1