Suggested problems

Biological Motivation

Made by artists who transform their dolls into [realistic record dolls][1] by adding real hair, eyelashes, and weight, they are mainly bought by mothers mourning the loss of a child. Although they still meet the emotional needs of women, most collectors love to play with them because they are so beautiful and because they are so realistic.

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