题解 | #简单密码#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String input = sc.nextLine();
            StringBuilder builder = new StringBuilder();
            for (char c : input.toCharArray()) {
                builder.append(getMapping(c));
            }
            System.out.println(builder);
        }
    }
    
    private static char getMapping(char input) {
        if ('0' <= input && '9' >= input) {// not change
            return input;
        }
        if ('A' <= input && 'Z' >= input) {
            if (input == 'Z') {
                return 'a';
            }
            return (char)('b' - 'A' + input);
        }
        if ('a' <= input && 'z' >= input) {
            return getLowerCaseMapping(input);
        }
        return input;
    }
    
    private static char getLowerCaseMapping(char input) {
        if ('a' <= input && 'c' >= input) {
            return '2';
        }
        if ('d' <= input && 'f' >= input) {
            return '3';
        }
        if ('g' <= input && 'i' >= input) {
            return '4';
        }
        if ('j' <= input && 'l' >= input) {
            return '5';
        }
        if ('m' <= input && 'o' >= input) {
            return '6';
        }
        if ('p' <= input && 's' >= input) {
            return '7';
        }
        if ('t' <= input && 'v' >= input) {
            return '8';
        }
        if ('w' <= input && 'z' >= input) {
            return '9';
        }
        return input;
    }
}