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... :)
radius of a spherical planet
Find out missing number from a vector of 9 elements
Calculate the derivative of a polynomial
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Optimum Egyptian Fractions
Pernicious Anniversary Problem
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