public class O3 {

  public class Top {
    protected int a = 0;

    public Top() { 
      String x = toString();
      System.out.println("new Top: = " + x);
    }

    public String toString() {
      return "Top (a = " + a + ")";
    }

  }

  public class Bottom extends Top {

    public Bottom(int i) {
      a = i;
    }

    public String toString() {
      return "Bottom (a = " + a + ")";
    }

  }


  public void top() {
    Top x = new Top();
    System.out.println("method top: " + x);
  }

  public void bottom() {
    Bottom x = new Bottom(23);
    System.out.println("method bottom: " + x);
  }


  public static void main(String[] args) {
    O3 olt = new O3();
    if (args.length != 0)
      olt.top();
    else olt.bottom();

  }
}