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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.
your brain is the compiler
my brain isn't braining
you can't use printing on codewars. you have to return a value. returning is basically just assigning a value to a function. you don't need to use input for codewars either, it gives you a parameter which is essentially just a variable that can change every time the function is called
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If you're using Python it probably has something to do with indentation.