Frequency analysis is a common task in cryptoanalysis. It is essentially counting the occurrences of alphabets (regardless of case).

So for example,

s = 'This is a very good day'

frequency = [2 0 0 2 1 0 1 1 2 0 0 0 0 0 2 0 0 1 2 1 0 1 0 0 2 0]

Frequency is organized from a-z.

Please write a program that performs this calculation.

Solve

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Last Solution submitted on Apr 07, 2026

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Riccardo G. Bin Jiang Lorenzo Robert Florin

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