#CA03 Problem9

#Given a dictionary the following dictionary
personal_info={"name": "Plato", "country": "Ancient Greece", "born": -427, "teacher": "Socrates", "student": "Aristotle"}

#Print when and where Plato was born.

#Change Plato's birth year from B.C. 427 to B.C. 428.

#Add the following item to the dictionary.
#"work": ["Apology", "Phaedo", "Republic", "Symposium"]

#Find and print how many keys there are in the dictionary.

#Find and print the key with the highest value in the dictionary.

#Find and print the key with the lowest value in the dictionary.