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... :)
Find all elements less than 0 or greater than 10 and replace them with NaN
Read a Soroban Abacus
Area of a triangle
Best Problem Elections
Alternative Scoring. Create an incremental spiral.
expand intervals vol.2
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