백준 자바 5622 문자열(다이얼)

https://www.acmicpc.net/problem/5622

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String s = br.readLine();

        int count=0;
        int k = s.length();

        for(int i = 0 ; i < k ; i++) {

            switch(s.charAt(i)) {
                case 'A' : case 'B': case 'C' :
                    count += 3;
                    break;

                case 'D' : case 'E': case 'F' :
                    count += 4;
                    break;

                case 'G' : case 'H': case 'I' :
                    count += 5;
                    break;

                case 'J' : case 'K': case 'L' :
                    count += 6;
                    break;

                case 'M' : case 'N': case 'O' :
                    count += 7;
                    break;

                case 'P' : case 'Q': case 'R' : case 'S' :
                    count += 8;
                    break;

                case 'T' : case 'U': case 'V' :
                    count += 9;
                    break;

                case 'W' : case 'X': case 'Y' : case 'Z' :
                    count += 10;
                    break;
            }
        }
        System.out.print(count);

    }
}