What is the result(three level class hierarchy)? : Questions « Object Oriented « SCJP

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class Alpha {
  static String s = " ";

  protected Alpha() {
    s += "alpha ";
  }
}

class SubAlpha extends Alpha {
  private SubAlpha() {
    s += "sub ";
  }
}

public class SubSubAlpha extends Alpha {
  private SubSubAlpha() {
    s += "subsub ";
  }

  public static void main(String[] args) {
    new SubSubAlpha();
    System.out.println(s);
  }
}