Computer scienceProgramming languagesPythonPython librariesRegular expressions

Regexps in programs

Theory

Count the letters

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You have a sequence that is made up of 4 letters ('A', 'C', 'G', 'T'). Write a program that counts how many times each letter appeared in the sequence, and prints it. If the letter does not occur in the string, then you shouldn't print it. Follow the format in the example below.

Sample Input 1: 

AAGAAGTTCC

Sample Output 1: 

A: 4
C: 2
G: 2
T: 2
Write a program in Python 3
import re

string = input()
# Write your code here
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