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Haskell Add function

import Data.List
import System.IO

type Stack = [Int]

step :: Stack -> String -> Stack
step stack "+" = head stack + stack !! l :drop 2 stack
step stack "-" = head stack + stack !! l :drop 2 stack
step stack "*" = head stack + stack !! l :drop 2 stack
step stack string = read string : stack

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