IF that is the logic behind it, the first 26 letters of your key would be
???????????W V C Z W D W V G Z Y V N M D S Y S F F X F V K R M
My logicmay be off, seing as that is a long key to remember, and that is as far as i am going to figure until i hear whether my logic is correct... but that doesnt tell me how to decrypt it regardless.
~Inquirer