1 12
1 1 10 8
1 1 8 10
1 1 9 3
1 1 7 4
1 1 2 4
1 1 5 4
1 1 2 5
1 1 9 9
1 1 3 5
1 1 9 2
1 1 9 5
1 1 5 9
1 1 6 4

Ans:
1
4

Also, check that you print "Impossilbe", when it's impossible to achieve the finish vertex