import java.io.*;
class A
{
	void print()
	{}
	
}
class B extends A
{
	void print()
	{
		System.out.println("In B");
	}
}
class C extends A
{
	void print()
	{
		System.out.println("In C");
	}
}
class D extends A
{
	void print()
	{
		System.out.println("In D");
	}
}
class E extends A
{
	void print()
	{
		System.out.println("In E");
	}
}
class F extends A
{
	void print()
	{
		System.out.println("In F");
	}
}
public class fh102
{
	public static void main(String args[])
	{
		A a[]=new A[5];
		a[0]=new B();
		a[1]=new C();
		a[2]=new D();
		a[3]=new E();
		a[4]=new F();
		for(int i=0;i<5;i++)
		if(a[i]instanceof C||a[i]instanceof D||a[i]instanceof E)
		a[i].print();
	}
}