I am having the same problem, my code works perfectly fine in the terminal. Also, I notice that no matter which test case I choose to run, it only ever runs the Basic Tests, so I wonder if this is related. Otherwise, I liked this as a nice first exercise in code wars, most of the others I've attempted at 8kyu have been undoable for me because I never have any clue what they're asking. This felt apporpriate for the level: straight forward, yet a challenge for a newbie.

Doing this in Python.