Python Classwork #1 (Subtraction)
01) Use Replit.com to write a Python program that has the user enter
    two numbers (of any type).  Then have your program subtract the
    smaller number from the larger number (larger minus smaller).
    Note that the user can enter the two numbers in any order, so it
    is up to your program to determine which number is larger.  If
    both numbers are the same, then your program must keep asking
    the user to re-enter the second number until it is different
    from the first number.

    Your program's output must be formatted exactly like the example
    output shown below.  You do not need to perform error trapping
    for the user input, and you may put all of your code into the
    main area of the program (that is, you are not required to create
    separate functions).  This program should not import or use any
    external functions.


    Example Program Run #1
    ----------------------
    Enter a number (integer or double):  42.7
    Enter another number, different from the first:  13

    The difference of your two numbers (42.7 minus 13) is 29.7.


    Example Program Run #2
    ----------------------
    Enter a number (integer or double):  85
    Enter another number, different from the first:  85

    Your second number needs to be different than your first number.
    Please re-enter a second number (other than 85):  85

    Your second number needs to be different than your first number.
    Please re-enter a second number (other than 85):  112.96

    The difference of your two numbers (112.96 minus 85) is 27.96.


  ADVANCED OPTION #1 FOR CLASSWORK #1
    In addition to displaying the difference of the two numbers, also
    compute and display the sum, product, and quotient of the two
    numbers.  For the quotient, divide the smaller number into the
    larger number.  If the smaller number is zero, display a message
    to the user indicating that division by zero is not allowed.

  ADVANCED OPTION #2 FOR CLASSWORK #1
    This advanced option may be may be added into your program along
    with, or instead of, the other advanced options.  Find and display
    both the arithmetic mean (average) and geometric mean of the two
    numbers entered by the user.

  ADVANCED OPTION #3 FOR CLASSWORK #1
    This advanced option may be may be added into your program along
    with, or instead of, the other advanced options.  Determine if
    the user has entered two integers (no doubles) and, if so, then
    compute and display both the greatest common factor and least
    common multiple of the two user-entered integers.