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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.
kata hint / knowledge sharing != kata suggestion.
That's one of the reasons I prefer JS / Python: less worrying about types :D Anyway, always keep an eye on sample tests cases if they're given.
But there's an example in description with integers. Also, there's a sample test with integers and characters. Is that not enough?