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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.
Prior to submitting this solution in Python, I had solved this problem in C++, and also written a simple calculator in Python, which this solution is based on :-)