3. write a function ticker() that first runs (calls) from problem 2 above, and then stores the returned dictionary. it then runs an interactive loop with the user in which the user is prompted for a company name. if the company name (key) is in the dictionary, then its ticker form and the ipo year is printed. otherwise a warning is printed that the company name is not in the list. if the user just hits return without entering a name, the loop stops.

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