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... :)
Rotate a Matrix
Is it a number?
03 - Matrix Variables 3
05 - Vector Equations 1
Area of a triangle
Modify subscripts - easier
Polite numbers. N-th polite number.
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