Given a dictionary

grade_counts = {"A": 8, "D": 3, "C": 6, "F": 2, "B": 15}

write a Python program that displays the following chart in which each row contains a key followed by the number of asterisks equal to the keys data value. The rows should be printed in key order, as shown below.

A: ********

B: ***************

C: ******

D: ***

F: **