/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
 
abstract class ParentClass {
    public abstract void methodA();
}
 
class ChildClass1 extends ParentClass {
    public void methodA() {
        System.out.println("Implementation from ChildClass1");
    }
}
 
class ChildClass2 extends ChildClass1 {
    public void methodA() {
        System.out.println("Implementation from ChildClass2");
    }
}
 
class ChildClass3 extends ChildClass2 {
    // ChildClass3 inherits the implementation of methodA from ChildClass2
    // It does not need to provide its own implementation
}
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		ChildClass3 object = new ChildClass3();
        object.methodA(); // Output: "Implementation from ChildClass2"
	}
}

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