input:

2
5 1 2
1 2
1 3
2 4
2 5
2 2
2 3
8 2 3
1 2
1 3
2 4
2 5
4 6
5 7
7 8
2 2
2 5
3 4

output:

4
5
7
-1
6

result:

wrong answer 4th numbers differ - expected: '8', found: '-1'