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... :)
Find the two-word state names
Selecting books on MATLAB for experts and beginners (blindfolded)
Make a random, non-repeating vector.
01 - Scalar variables
expand intervals vol.2
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