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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.
I don't think either is more right. Yonog1's answer exactly matches the requirement "returns a new list with the strings filtered out" whereas yours techinically returns a new list of only integers. Assuming the input is limited to integers and strings as stated, either works.
Please mark your post as having spoiler content next time.