Creating a randomly generated 4 character string (A-Z)

So I'm trying to make the computer guess a word that I have given. It essentially has to randomly guess a 4 character long string (A-Z). Basically a guessing game with the computer guessing the word that I picked. Any help would be appreciated. I'm mainly stuck on the part where it generates a random string as it's guess.

Answer 1

[KSSV]

doc randseq