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Compress the String! TipThis is quite simple problem if you understand how to use groupby()Focus two variables(k and g) are iterated from groupby()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)