/* package whatever; // don't place package name! */

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

/* 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
	{
		A a = new B();
		C c = (C) a;
	}
	
	
	static class A{}
	static class B extends A{}
	static class C extends A{}
}