How would I make combination/quick-time events?

How would I make the User type in a bunch of random letters, sort of like a thing that all players will do which is a randomized letter sequence thing, sort of like a thing that I can just fire off a invoke server or something… I’m not sure where to start and this is what its meant to look like. I’ve tried using context action service but its not really the best method I think unless it is. I’m really not sure where to start off at.

Concept: