/* 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
	{
		System.out.println(A.foo);
		System.out.println(B.foo);
	}
}
 
class A{
	public static final Set foo;
	static{
		foo = new HashSet<String>();
		foo.add("A");
	}
}
 
class B extends A{
	public static final Set foo;
	static{
		foo = new HashSet<String>();
		foo.add("B");
	}
}

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