Help me in solving AJOOP10 problem

help
,
1

My issue

My code

import java.util.*;
import java.lang.*;
import java.io.*;

class Animal {
    public void eat() {
        System.out.println("Animal is eating.");
    }
    
    public void sleep() {
        System.out.println("Animal is sleeping.");
    }
}

class Dog extends Animal {
    public void bark() {
        System.out.println("Dog is barking.");
    }
    
    public void breed() {
        System.out.println("Dog is breeding.");
    }
}

class Codechef {
    public static void main (String[])
}

Learning course: Learn Advance Java
Problem Link: CodeChef: Practical coding for everyone