it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
I agree with Alfonso.
@Mehmet can you explain why?
Energy of a photon
Add more zeros
~~~~~~~ WAVE ~~~~~~~~~
Find the biggest digit in a matrix
Determine if input is a valid AHP evaluation matrix
Recaman Sequence - III
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