def menu(): print("[1] Load Shapes") print("[2]Exit the program") print("[3] Add shapes") print("[4] Save shapes") option = int(input("Enter your option:")) while option != 0: if option > 4: print("Error:please enter a valid number.") break   I'd like to add some error handling in here so that if a user types in a letter it prints a message saying "please only enter numbers, no letters"

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