Connect / Sort Lines?

Hey, I have a pile of lines comming from kangaroo. They are all in a terrible (non) order, BUT at least start/end points of each segment is at the right place ( see screenshot)

What is the best way to get the lines together again? The plan is (in this case) to get 4 proper polylines out of the pile...

Whats the best way to deal with this situation?

Thanks a lot!!

Cheers