# Suggested problems

Nov. 4, 2022, 9:26 a.m. by norxhealthcare

## Biological Motivation

Attention Deficit Hyperactivity Disorder or ADHD is a common condition in which children and adults have trouble concentrating, staying still, focusing on tasks, and being attentive to details. There are several ways ADHD can be treated. One way to treat ADHD is with medication. Adderall is a medication that is commonly prescribed for ADHD. Adderall can help improve focus, concentration, and attention span. It can also help reduce impulsive behavior and hyperactivity.

## 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