input:

50000
10 19
12 6 1 12 11 15 4 1 13 18
10 8
8 7 6 7 6 2 2 3 4 8
10 6
3 2 6 6 5 2 3 4 5 6
10 11
6 3 7 9 2 1 2 10 10 4
10 6
6 1 2 6 1 1 3 4 2 1
10 9
8 5 3 9 1 7 5 5 1 1
10 5
1 4 3 2 5 4 5 3 5 2
10 14
3 8 12 10 4 2 3 13 7 3
10 14
5 5 12 2 8 1 13 9 8 5
10 7
5 5 6 6 1 5 3 7 3 4
10 7
5 1 4 6 1 6 4 3 7 5
10...

output:

3
1
2
4
2
3
3
3
3
3
4
5
2
3
-1
3
1
3
7
6
3
3
-1
2
4
4
6
2
3
0
6
1
2
2
2
5
3
3
3
3
2
5
2
1
3
3
2
3
1
4
2
2
4
4
2
2
5
3
2
1
4
3
3
3
2
3
0
4
7
6
2
2
4
3
3
4
-1
6
3
3
3
3
4
0
1
1
4
5
4
5
3
1
1
2
1
3
3
4
4
3
4
2
1
3
4
4
3
-1
3
4
3
5
4
4
2
4
6
4
4
5
3
4
5
1
4
3
3
3
3
-1
3
2
1
2
5
1
2
1
4
4
2
2
4
5
4
3
-1
...

result:

wrong answer 1st numbers differ - expected: '6', found: '3'