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... :)
The Goldbach Conjecture, Part 2
Equidistant numbers containing certain value in an interval
Back to basics 23 - Triangular matrix
What number has this problem?
expand intervals vol.3
Polite numbers. N-th polite number.
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(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
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