25/0 Why in the world did I get A+?

So, was playing some games as Jhin. I was doing half decent, then played this game with some friends and litteraly went 25/0/11. (one of those very fun games btw) https://matchhistory.eune.leagueoflegends.com/en/#match-details/EUN1/2175819952/203314687 The thing is, I got an A+...? Like.... plz.... why??? Could someone explain why? I am at the moment a bit confused... Thank you all for any response beforehand!
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