/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
 
abstract class AbstractClass {
    abstract void methodA();
}
 
class ChildClass1 extends AbstractClass {
    void methodA() {
        // Implementation for methodA
        System.out.println("I am ChildClass1's methodA");
    }
}
 
class ChildClass2 extends ChildClass1 {
    // No implementation for methodA
}
 
class ChildClass3 extends ChildClass2 {
    // No implementation for methodA
}
 
/* 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
	{
 
		ChildClass1 object1 = new ChildClass1();
		ChildClass1 object2 = new ChildClass2();
		ChildClass3 object3 = new ChildClass3();
 
		object1.methodA();
		object2.methodA();
		object3.methodA();
	}
}

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