# Conversion utility problem

# Function to return valid input 
def GetInput():
    ValidInput = False
    # Validation
    while not ValidInput:
        Number = input(": ")
        # Type check
        if Number.isnumeric():
            ValidInput = True
        if not ValidInput:
            print("Invalid input.")
    return int(Number)

# Subroutine to convert feet to inches
def FeetToInches():
    print("Enter the number of feet.")
    Feet = GetInput()
    Inches = Feet * 12
    print("{} feet is {:.2f} inches".format(Feet, Inches))

# Subroutine to convert inches to feet
def InchesToFeet():
    print("Enter the number of inches.")
    Inches = GetInput()
    Feet = Inches / 12
    print("{} inches is {:.2f} feet".format(Inches, Feet))

# Subroutine to offer the conversion choice to the user
def Menu():
    MenuChoice = 0
    # Iterate until quit is chosen
    while MenuChoice != 3:
        print("1. Feet to inches")
        print("2. Inches to feet")
        print("3. Quit")
        MenuChoice = GetInput()
        # Action menu choice
        if MenuChoice == 1:
            FeetToInches()
        elif MenuChoice == 2:
            InchesToFeet()
        elif MenuChoice == 3:
            print("Goodbye.")
        else:
            print("Invalid input.")
        print("-------------------------")

# Main program
Menu()