# Suggested problems

## What causes Yahoo Mail Keeps Crashing

May 10, 2022, 9:13 a.m. by gerrymax

## Biological Motivation

It can be irritating to have your mail service crash frequently, preventing you from accessing your emails and doing meaningful work. This can have a variety of causes. Some of these issues that contribute to Yahoo Mail keeps crashing are your web browser is not of the latest version and is restricting Yahoo Mail, repeated malware attacks, a firewall stopping the Yahoo data.

## 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