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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 an exact duplicate of the kata pointed by Hobovsky (a direct implementation of my Javascript solution passed the tests immediately). You should retire it and make a Ruby translation to the other kata, there is still no one. This kata will never get to be approvable otherwise.
Is your kata a duplicate of Evaluate a postfix expression?