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... :)
Rotate and display numbered tile
Convert a vector into a number
Basics: 'Find the eigenvalues of given matrix
Output any real number that is neither positive nor negative
Number of digits in an integer
Arithmetic/geometric sequence, 50/50
Pernicious Anniversary Problem
Polite numbers. Politeness.
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