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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 quote the details of the kata : "(** number of inhabitants is an integer **)"
It's probably related ;)
Why would they be true, if they're only 8 minutes long? (check the title of the kata)
Read this: https://docs.codewars.com/training/troubleshooting/
This is not a kata issue at all...
You need to return the result, not print it to console.