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Compress the String!

Tip

1. This is quite simple problem if you understand how to use groupby()
1. Focus two variables(k and g) are iterated from groupby()
2. As an example groupby('aaabb'),  g is 'aaa', and k is 'a'

Solution

from itertools import groupby s = input() o = [(len(list(g)), int(k)) for k, g in groupby(s)] print(*o)