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 alphabetic word product
Sums with Excluded Digits
Test for balanced parentheses
Inner product of two vectors
01 - Scalar variables
Pancake sorting - minimum flips.
Cut an orange
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