package task2;

import java.util.Scanner;

public class Task {
    /********* Begin *********/
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String username = sc.next();
        // 判断用户名
        if (username.length() < 3) {
            try {
                throw new MyException("用户名小于3位Exception");
            } catch (MyException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } else {
            System.out.println("用户名格式正确");
        }

    }
}

class MyException extends java.lang.Exception {
    public MyException() {
        super();

    }

    public MyException(String msg) {
        super(msg);
    }
}
/********* End *********/
