import java.io.*;

class ListFiles {

	public static void main(String [] args ) {
		File f;
		try {
			f = new File(args[0]);
			Print(f,"");
		} catch (Exception e) {
			System.out.println("Invalid usage");
			e.printStackTrace();
		}
	}

	static public void Print(File f,String indent) {
		if (f.isFile() ) {
			System.out.println(indent + f.getName()+ " (" + f.length() + " bytes)");
		} else if (f.isDirectory()) {
			System.out.println(indent + f.getName() + " (is a directory)");
			File[] sublist = f.listFiles();
			for (int i=0;i<sublist.length;i++) {
				Print(sublist[i],indent+"  ");
			}
		}
	}		
}