re: Yall remember when McDonalds did Monopoly?

I remember Coke doing a bottle cap game in the early 80’s where they had a letter under the cap. You had to spell out something like
“The Real Thing” The E was the letter that was hard to find if I remember correctly. I had all but like two, as did everyone else. We would trade letters with friends that had one you didn’t and Vice Versa.
Anyone remember what I’m talking abou?
Pepsi had one as well. Maybe had to spell Challenge or New Generation, whatever.