using copy.copy(), should not be able to manipulate input.

removed silly try-except from earlier hotfix

fixed

Separated test variables to prevent input manipulation.

I ran 2 million iterations and could not replicate, added a try-except for now as a hotfix until I understand the issue better.

Do you know the steps to reproduce this error?

Added longer test cases.

Thank you for your input. Yeah, I was curoius if these would be easily solvable. It is based on a common principle, but if someone were to come in and make the wrong assumptions or not make any assumptions, I definitely see how this could be very frustrating.

I can increase lengths on random tests, but I do actually agree with @Blind4Basics on this one. It may be far too tedious to get the correct solution if someone does not immediately assume the method used.

Thank you for your input. I have never done this before. I could not find a very similar kata, but I did assume it has been done. I'll see about fixing random tests.

Possible Python 3.6 solution

I have no idea how kumite works... I'm also guessing this has been done before. But here it is.