12926.kt

class Solution {
    fun solution(s: String, n: Int): String {

        return s.toCharArray().map { map(it, n) }.joinToString("")
    }

    private fun map(s: Char, n: Int): Char {
        val ch = s.toInt()

        if (ch in 65..90){
            return if (ch + n in 65..90){
                (ch+n).toChar()
            }else{
                (ch+n-26).toChar()
            }
        }

        if (ch in 97..122){
            return if (ch + n in 97..122){
                (ch+n).toChar()
            }else{
                (ch+n-26).toChar()
            }
        }

        return ' '
    }
}