Suggested problems

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Biological Motivation

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-------------- : ADHD is a medical condition that affects how well someone can focus, pay attention, and control impulsive behaviors. People with ADHD may have trouble paying attention to details or may be easily distracted. They may also act impulsively without thinking about what they are doing.

Most people with ADHD have problems with more than one of these areas. ADHD can make it hard for people to do well in school, at work, or in social situations. It can also lead to problems with relationships.


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


Sample Output

20 12 17 21