How can I compare two strings to see if one is greater then the other

I am working on a basic card game. I have the user shuffle two cards and I want to be able to know if the cards are equal or if one is greater then the other or less then the other. Currently I can only tell if they are equal.

let playerCard = playerNum.text
    let dealerCard = dealerNum.text
    if playerCard == dealerCard {
        print("These two strings are considered equal")
    }