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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.
I thought this one was simple enough, but I either run into a memory error, or in a runtime error, depending on the method I choose.
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There seems to be one test case that doesn't follow the rules set out in the description. I get a result:
masking: 3656013700
######3700 matches #######7##
'######3700' should equal '#######7##'