Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I'm so mad I didn't think of this lol
I didn't even know you could do this lol
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Print the input, I guess one of them is an empty list and hence the error you get. And you don't even need to guess, you can see it passes the first 3 sample tests and fails with the 4th one that's an empty list.
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