HackerRank Python - Compress the String

In this task, we would like for you to appreciate the usefulness of the groupby() function of itertools . To read more about this function, Check this out .

# Enter your code here. Read input from STDIN. Print output to STDOUT

from itertools import groupby

for key, group in groupby(input()):
    print((len(list(group)), int(key)), end=' ')