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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.
The Python version of this problem maybe broken!
I'm sure that I have got the correct answer, and the same answer can pass the JavaScript version of this problem.
And my answer can also print out multiple lines of knock-knock conversations in the screen indicates that I've finish the tasks.