Python Classwork: Name Info
    Write a Python program named "NameInfo.py" that has the user
    enter his/her first name, followed by his/her last name.  Each
    name should be stored in a separate variable.  Then have your
    program display the following:

    Line #1) The user's last name, a comma, and the first name
    Line #2) The user's initials
    Line #3) The last three letters of the first name
    Line #4) The fourth letter of the last name
    Line #5) The total number of letters in the full name
    Line #6) The last name with the order of the letters reversed

    Assume that the user enters only letters (no punctuation or spaces),
    that each name contains at least five letters, and that each name
    starts with a capital letter.

    Your program's output should be formatted in a manner similar to
    what is 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
    -------------------
    What is your first name?  David
    What is your last name?  Goldsmith

    Goldsmith, David
    DG
    vid
    d
    14
    htimsdloG


  ADVANCED OPTION #1
    Display the first and last names with the letters intermingled.
    Within each name the letters should be displayed in order, but
    your program should alternate between the first and last names.
    For example, with a first name of "David" and a last name of
    "Goldsmith", your program would display "DGaovliddsmith".  As
    you can see from that example, if your program runs out of
    letters from one of the names, then the remaining letters in
    the other name should be displayed at the end.

  ADVANCED OPTION #2
    In addition to displaying the information described above, also
    have your program display the number of occurrences (the frequency)
    of each letter in the user's full name (ignoring case).  In other
    words, tell how many times each letter appears.  This advanced
    option may be completed along with, or instead of, the above
    advanced option.