class ClassOne{
  public void print()
  { 
    System.out.println( " inside ClassOne");
  } 
}

class ClassTwo extends ClassOne {
  public void print()
  {
    System.out.println( " inside ClassTwo");
  } 
  public void bar()
  {
    System.out.println("bar in ClassTwo called");
  }
}

abstract class ClassThree
{
  abstract public void print();
  public void foo()
  {
    System.out.println("In foo from ClassThree");
  }
}

class ClassFour extends ClassThree
{
  public void print()
  {
    System.out.println("In print from ClassFour");
  }
}