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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.
Leading 0's are not perrmited, as no "real" numbers have them (except 0 itself).
Your solution does have leading 0's, "03" != "3"
I think you're making harder than it needs to be. Do a little bit of research on mathematical operators in regards to JS.