Main {
(@
  static public void main(String args[]) throws Exception {
    Commands cs = Commands.parse(System.in);
    cs.print();
    System.out.println();
    FileSystem fs = 
    new FileSystem(
      new CompoundFile(
	new FileName(
	  new Ident ("root")),
	new File_PList()
        )
    );
    File_PList filelist1 = fs.get_root().get_contents();
    CompoundFile a = 
      new CompoundFile(
        new FileName(
          new Ident ("a")
	),
	new File_PList()
      );
      filelist1.addElement(a);
    CompoundFile b = 
      new CompoundFile(
        new FileName(
          new Ident ("b")
	),
	new File_PList()
      );
      filelist1.addElement(b);
    File_PList filelist2 = a.get_contents();
    CompoundFile c = 
      new CompoundFile(
        new FileName(
          new Ident ("c")
	),
	new File_PList()
      );
      filelist2.addElement(c); 
    CompoundFile d = 
      new CompoundFile(
        new FileName(
          new Ident ("d")
	),
	new File_PList()
      );
      filelist2.addElement(d); 
    fs.display();
    System.out.println();

  }
@)
}