There are only 25 possible settings for a Caesarean cipher. You may be thinking of a substitution cipher, but the clue indicates a Caesarian cipher, as you corr

There are only 25 possible settings for a Caesarean cipher. You may be thinking of a substitution cipher, but the clue indicates a Caesarian cipher, as you correctly figured out. The problem is probably that you're feeding a correct answer in a phrasing that the system will not accept.