input:

116
4 0
3 2 6 6
4 1
3 2 6 6
10 19
10 2 8 4 2 4 9 3 3 3
4 8
3 9 3 6
2 19
2 10
11 15
3 1 1 4 3 7 10 8 6 7 10
10 14
8 7 1 1 10 9 2 8 10 7
2 13
2 3
10 10
8 1 6 6 9 4 7 1 8 8
7 14
6 7 4 5 3 1 3
11 6
8 1 10 9 7 2 6 6 1 3 9
4 10
6 1 3 8
7 7
10 6 2 10 4 7 2
5 11
9 10 5 9 2
9 1
2 4 8 6 2 8 8 1 6
4 5
7 2 9 8
...

output:

-1
-1
4
6
18
3
2
12
1
4
-1
4
2
6
-1
2
24
3
30
10
-1
2
3
-1
-1
2
6
-1
1
6
24
28
1
3
3
-1
4
10
6
4
1
5
-1
1
-1
7
30
2
-1
-1
16
8
-1
30
2
25
4
2
-1
-1
2
-1
2
-1
5
2
-1
-1
-1
-1
5
-1
4
4
28
-1
-1
21
3
-1
2
4
-1
-1
14
4
6
1
-1
5
12
3
8
-1
4
-1
10
12
5
6
1
6
9
-1
725
-1
17
132
676
588
110
-1
163
581298493...

result:

wrong answer 1st numbers differ - expected: '0', found: '-1'