题解 | #简单密码#

import java.util.Scanner;

// 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.hasNextInt()) { // 注意 while 处理多个 case
        //     int a = in.nextInt();
        //     int b = in.nextInt();
        //     System.out.println(a + b);
        // }
        String line = in.nextLine();
        for (int i = 0; i < line.length(); i++) {
            char c = line.charAt(i);
            if (c >= 'a' && c <= 'c') {
                System.out.print(2);
                continue;
            }
            if (c >= 'd' && c <= 'f') {
                System.out.print(3);
                continue;
            }
            if (c >= 'g' && c <= 'i') {
                System.out.print(4);
                continue;
            }
            if (c >= 'j' && c <= 'l') {
                System.out.print(5);
                continue;
            }
            if (c >= 'm' && c <= 'o') {
                System.out.print(6);
                continue;
            }
            if (c >= 'p' && c <= 's') {
                System.out.print(7);
                continue;
            }
            if (c >= 't' && c <= 'v') {
                System.out.print(8);
                continue;
            }
            if (c >= 'w' && c <= 'z') {
                System.out.print(9);
                continue;
            }
            if (c >= 'A' && c <='Z') {
                if (c == 'Z') {
                    System.out.print('a');
                    continue;
                }
                char n = 'a' - 'A';
                System.out.print((char)(c + n + 1));
                continue;
            }
            System.out.print(c);
        }
    }
}