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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.
What if the string contains digits? I'm not seeing where your code handles digits, only letters.
Yes, I agree with @ParanoidUser. Java is overflowing like crazy in the evaluation tests. My solution passes basic tests just fine.