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... :)
Read a column of numbers and interpolate missing data
Remove white space from the string
What's Your BMI?
Count decimal digits of a number
Area of a Square
Which permutation is it?
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