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... :)
Nonuniform quantizer as a piecewise constant function
05 - Vector Equations 1
Add a row of zeros on top of a matrix
Polite numbers. Politeness.
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Cut an orange
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