The test suite should check the size of the answer. It seems kind of a cheat to give an answer with 8 characters when the encrypted message has length 10. We can't be sure if the person found the asnwer for the two last characters or not.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
Remove all the consonants
High school cafeteria
Roll the Dice!
Selecting books on MATLAB for experts and beginners (blindfolded)
expand intervals vol.2
Calculate the Damerau-Levenshtein distance between two strings.
Pancakes for everyone!
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