It only checks that the output is sorted, not that it's a sorted version of the original string.
The first answer that apparently works has a comment stating that it fails with more than 2 duplicates; indeed I tried a list with three 3s and the resulting passing answer only had one of those threes.
The first answer that apparently works has a comment stating that it fails with more than 2 duplicates; indeed I tried a list with three 3s and the resulting passing answer only had one of those threes.