[1, 2, 1, 8]
1
[7, 4, 9, 7]
-1
[3, 4, 9, 3]
-1
[4, 1, 4, 5]
1
[5, 9, 6, 4]
-1
[1, 4, 6, 2]
2
[6, 2, 6, 9]
1
[2, 9, 10, 3]
2
[6, 4, 4, 1]
2
[7, 5, 3, 7]
-1