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... :)
Encode Roman Numerals
So many choices
What number has this problem?
Find maximum value of a curve
Another colon problem
Polite numbers. Politeness.
Arithmetic/geometric sequence, 50/50
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