Suggested problems

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Biological Motivation

This medicine works best if used as soon as the pain hits. Waiting for the pain to increase can significantly affect its effects. Doctors strictly recommend not giving Tramadol to a person without a prescription regardless of the similarity of health conditions.

Pregnant women must consult with a doctor before taking this medicine because of the lack of evidence that indicates the safety of the fetus. Babies born dependent on medication may need medical services for several weeks.

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Problem

A string is simply an ordered collection of symbols selected from some alphabet and formed into a word; the length of a string is the number of symbols that it contains.

An example of an DNA string (whose alphabet contains the symbols A, C, G, and T) is ATGCTTCAGAAAGGTCTTACG.

Given: A DNA string $s$ of length at most 1000 nucleotides.

Return: Four integers corresponding to the number of times that the symbols A, C, G, and T occur in $s$.

Sample Dataset

AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC

Sample Output

20 12 17 21