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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.
No, you're wrong. Print the input instead of guessing what it was.
I cannot see the code for test 4 and 5 but based on the error I can know that test 4 failed because the input is an octal number(it starts with zero) and test 5 is missing the last digit when setting the input, so these tests need to be corrected.