I like this style, but the one thing that would drive me crazy using a program like this is that I wouldn't have any idea of how to exit. While I don't like cumbersome prompts like "Enter an acronym, upper or lower case, or enter something that starts with Q (also upper or lower case) to quit:" perhaps some indication of how to get out would be beneficial?

I know this is probably a moot point for a script like this, but I spend too much time in programs with really bad UIs to ignore it...