counts = ["1900,google.com", "160,mail.google.com", "20,mobile.sports.yahoo.com", "10,sports.yahoo.com", "5,stackoverflow.com", "1,en.wikipedia.org", "2,es.wikipedia.org", "1,mobile.sports"]

Write a PYTHON function that takes this input as a parameter and returns a data structure containing the number of hits that were recorded on each domain AND each domain under it. For example, an impression on "mail.yahoo.com", counts for "mail.yahoo.com", "yahoo.com", and "com" (Subdomains are added to the left of their parent domain. So "mail" and "mail.yahoo" are not valid domains. Note that "mobile.sports" appears as a separate domain as the last item of the input.)