input:

5553
12 19
8 8 11 18 12 9 15 38 6 32 30 30
17 28 33 2 37 20 11 38 36 18 18 30 20 33 13 31 33 37 8
12 6
7 12 14 2 19 2 17 7 4 20 1 13
7 18 23 22 1 16
8 7
5 2 4 2 4 5 8 12
13 16 6 6 5 16 11
5 7
5 13 3 8 3
11 6 9 11 13 8 11
17 19
944782509 244117333 140979583 661724696 617847780 321687699 418677763 725...

output:

1
12
1
Impossible
4
8
20
20
2
4
5
2
4
1
4
3
2
4
2
3
5
4
1
4
9
1
3
9
Impossible
2
1
1
5
1
2
Impossible
4
16
4
4
11
20
5
Impossible
3
5
4
4
5
Impossible
3
2
4
5
5
2
2
8
3
2
3
1
2
7
2
5
3
2
1
2
5
4
6
3
1
4
Impossible
1
Impossible
3
4
Impossible
9
2
2
Impossible
16
5
Impossible
4
3
14
3
4
3
2
1
3
3
2
3
...

result:

wrong answer 2nd lines differ - expected: '3', found: '12'