'''
Example Problem showing how to use a loop with user input to determine when to exit.

Instructions:

Write a program that allows a user to create a list of Fahrenheit values that
can be converted to Celsius values in a second list.  Your program will display
a menu of options to the user.  The user is free to select any option from the
menu in any order.  You will display a "> " prompt for the user.

Write the code (functions) that will perform the tasks for each menu option.
Implement this code so that it allows the user to continue to make menu choices
until they enter q for quit.

Sample Output:

Welcome. Let's convert Fahrenheit values to Celsius.

Options:
a - add Fahrenheit values to a list
c - convert F values to C values
d - display F list and C list
? - display options
q - quit

> a
Enter a Fahrenheit value: 22
> a
Enter a Fahrenheit value: 35
> c
2 values converted
> d
List of Fahrenheit values:
22.0
35.0
List of Celsius values:
-5.6
1.7
> ?
Options:
a - add Fahrenheit values to a list
c - convert F values to C values
d - display F list and C list
? - display options
q - quit
> q
Thanks for converting!
'''
# TODO add your program code here

