Suggested problems

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Biological Motivation

Anxiety is a day-to-day emotion; it is the brain’s way of reacting to stress and alerting the possible danger ahead. Everyone feels troubled now and then; for example, you may worry when confronted with a problem at work, before making a major decision, or before taking a test. Occasional anxiety is okay, but anxiety disorders are different. They are a group of mental illnesses that cause overwhelming and constant anxiety and fear. Excessive anxiety can make you avoid school, family gatherings, avoid and other social situations that might worsen or trigger your symptoms.

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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