Erase all duplicate letters in the message. Only one letter remains: the 17th one in the alphabet.
Try this messsage:
THE UNITED STATES ONE HUNDRED DOLLAR BILL
ENB?
UHB?
SpyNavy
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
"Try this messsage:
THE UNITED STATES ONE HUNDRED DOLLAR BILL"
Didn't anybody play that game with a boy's name and a girl's name to see what your future might bring?! Mark out the same letters in each person's name and - I don't really remember the rest.
But I did the same with goldbux' post, USING PAPER AND PENCIL:

The ONLY letter left is B.
Now, what significance there is other than realizing how previous post #190 ended up with the letter Q, I have no idea.
But it was a great lesson, IMO, of following directions. Kinda like that "read everything before you do anything test" where you do all kinds of stupid things UNTIL you read to the final step and you're just to write your name on the paper.😄
((hugs))
??
only the B is left ?