# Suggested problems

Nov. 4, 2022, 9:31 a.m. by norxhealthcare

## Biological Motivation

Adderall is a medication that is used to treat attention deficit hyperactivity disorder (ADHD). It is a central nervous system stimulant that works by increasing the levels of certain chemicals in the brain. Adderall is available in both immediate-release and extended-release forms. The extended-release form of Adderall is also known as Adderall XR.

## 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