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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.
This is another copy of both Goldtom and KataSideKick's answer.
This logic is not correct. It should check if All char are digits, not if any are digits.
Why repaste someone elses answer if all you are going to do is change one variable from x to c? What is the point?