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Everything's working correctly now.

jhoffner already fixed this.

You are making the mistake of saying that strings can't be iterated without converting to list.

You can already do roman[::-1] perfectly fine on any string. Strings are essentially an array from characters. You have C to thank for that.

This was a bug in Codewars that has since been fixed.

The random tests fail if you remove "import string" from the template code.