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... :)
Back and Forth Rows
Back to basics 15 - Benchmark
Is A the inverse of B?
Add two numbers
Don't Try, give up and return NaN.
Pernicious Anniversary Problem
How many solutions has this problem?
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