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... :)
Test if a Number is a Palindrome without using any String Operations
Swap the input arguments
Basics: Divide integers to get integer outputs in all cases
Are you in XY plane?
expand intervals vol.2
How many solutions has this problem?
expand intervals vol.3
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