题解 | #简单密码#

import java.util.Scanner;

import java.util.regex.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String a = in.nextLine();
            char[] arr=a.toCharArray();
            int p=0;
            while(p<arr.length){
                char x=arr[p];
                String result=mima(Character.toString(x));
                System.out.print(result);
                p++;
            }
        }
    }

    public static String mima(String input){
        if(Pattern.matches("[abc]",input)){
            return "2";
        }
        if(Pattern.matches("[def]",input)){
            return "3";
        }
        if(Pattern.matches("[ghi]",input)){
            return "4";
        }
        if(Pattern.matches("[jkl]",input)){
            return "5";
        }
        if(Pattern.matches("[mno]",input)){
            return "6";
        }
        if(Pattern.matches("[pqrs]",input)){
            return "7";
        }
        if(Pattern.matches("[tuv]",input)){
            return "8";
        }
        if(Pattern.matches("[wxyz]",input)){
            return "9";
        }
        if(Pattern.matches("[A-Z]",input)){
            String lower=input.toLowerCase();
            char x=lower.charAt(0);
            if(Character.compare(x,'z')==0){
                return String.valueOf('a');
            }
            char y=(char)(x+1);
            return String.valueOf(y);
        }
        
        return input;
    }
}