My owne code includes numbers and letters. I will finish the blog post of with my code and a sentence to work out.

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 24  X  22 V 20  T 18  R 16 P 14 N 12  L  10  J 8  G  6 F  4 D 2 B  0

GZ18 22F22V