题解 | #简单密码#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println(solution(in.nextLine()));
    }

    public static String solution(String info) {
        char[] chars = info.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            chars[i] = convert(chars[i]);
        }
        return String.valueOf(chars);
    }

    public static char convert(char c) {
        // abc--2, def--3, ghi--4, jkl--5, mno--6, pqr--7
        if ('a' <= c && c <= 'r') {
            return (char) (((c - 'a') / 3) + '2');
        }
        if ('A' <= c && c <= 'Z') {
            // 33 = ('a' - 'A') + 1 当 c == 'Z' 不再平行偏移 所以比较特殊
            return c == 'Z' ? 'a' : (char) (c + 33);
        }
        return switch (c) {
            case 's' -> '7';
            case 't', 'u', 'v' -> '8';
            case 'w', 'x', 'y', 'z' -> '9';
            default -> c;
        };
    }
}