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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.
Maybe you are converting the input to an integer, you should try using float to check if the input is a number, remember that the input can also be a float, if you use int then it would round the number and your response would not match the given in the kata, and then when you return your response, convert it to an int before sending it.
Your code has a bug, not a kata issue. Print the input to help you debug your code.