Write a piece of code that reads a shorthand text description of a color and prints the longer equivalent. Acceptable color names are B for Blue, G for Green, and R for Red. If the user types something other than B, G, or R, the program should print an error message. Make your program case-insensitive so that the user can type an uppercase or lowercase letter. Here are two example executions:
What color do you want? R
You have chosen Red.
What color do you want? Bork
Unknown color: Bork
