📝 Algorithm/코딩테스트

import Foundation func checkLowerCase(_ input: String) -> Bool { let lowercaseSet = CharacterSet.lowercaseLetters return input.rangeOfCharacter(from: lowercaseSet.inverted) == nil } let st = ["ss", "s1", "11", "SS", "d-"] for s in st { if checkLowerCase(s) { print(s) } } // ss https://developer.apple.com/documentation/foundation/characterset