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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.
Look at what the function range() does. Here you iterate from 0 up to 1000 included.
Re-read the instruction. Re-read your code, then you will find your mistake as your program logic isn't wrong.
I don't get where the issue is, if you change it during the kata it works just fine. Can't we view it as a way to learn how to debug?