input:

6
5 3
1 2 2 3 3
2 3 4
4 2
1 2 2 4
2 4
5 2
2 3 3 4 4
5 5
6 1
1 1 1 1 1 1
4
4 2
1 1 1 2
2 2
4 1
1 1 1 1
2

output:

2
1 3 
-1
3
2 4 4 
5
1 1 2 3 1 
2
1 1 
-1

result:

wrong answer Wrong answer, erase a number that does not exist (test case 4)