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... :)
Summing Digits within Text
Find the largest value in the 3D matrix
Create a square matrix of multiples
Area of a triangle
Modify subscripts - easier
expand intervals vol.3
Don't Try, give up and return NaN.
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