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... :)
Solve the set of simultaneous linear equations
Convert hex color specification to MATLAB RGB
Who invented zero?
Polite numbers. N-th polite number.
Which permutation is it?
Cut an orange
Pancake sorting - minimum flips.
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