프로그래머스 - 숫자 문자열과 영단어 (2021 카카오 채용연계형 인턴쉽)

import Foundation

func solution(_ s:String) -> Int {
    return Int(s
        .replacingOccurrences(of: "zero", with: "0")
        .replacingOccurrences(of: "one", with: "1")
        .replacingOccurrences(of: "two", with: "2")
        .replacingOccurrences(of: "three", with: "3")
        .replacingOccurrences(of: "four", with: "4")
        .replacingOccurrences(of: "five", with: "5")
        .replacingOccurrences(of: "six", with: "6")
        .replacingOccurrences(of: "seven", with: "7")
        .replacingOccurrences(of: "eight", with: "8")
        .replacingOccurrences(of: "nine", with: "9"))!
}