The Bookcase

You walk over to the bookcase and glance over some of the titles.  A particularly tall book catches your eye.  You pull it out and read the title: "Encyclopedia of Codes and Methods of Encryption".  You flip to a random page and note the following table.

Letter in Uncoded Writing


 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Z Y X W V U T S R Q P O N M L K J I H G F E D C B A

Letter in Coded Writing

    To decode this method of encryption, replace each letter in the coded message with the letter written above it in the above table.  To code a message using this method, replace each letter of your message with the letter written below it in the table.