import java.io.*;
import java.util.*;

public class NonRcTree {
    public static void main(String[] args) {
        File fp = null;
        Vector<File> vf = null;
        Vector<Integer> s = null;
        try {
        fp = new File(args[0]);
        } catch (ArrayIndexOutOfBoundsException e) {
            System.out.println("args error!");
            System.exit(0);
        }
        System.out.println("Punto di partenza : " + fp.toString());
        vf = new Vector<File>();
        s = new Vector<Integer>();
        if (!fp.isDirectory()) {
            System.out.println("arg: " + fp.toString() + " -> error!");
            System.exit(0);
        }
        vf.add(fp);
        s.add(0);
        int spazio = 0;
        String sp = null;
        while (!vf.isEmpty()) {
            sp = "";
            File [] fArray = vf.firstElement().listFiles();
            spazio = s.firstElement() +1;
            for (int i = 0; i < s.firstElement(); i++) sp += " ";
            System.out.println("DDD - " + sp + vf.firstElement().getName());
            for (File x: fArray) {
                if (x.isDirectory()) {
                    vf.add(x);
                    s.add(spazio);
                }
                else {
                    if (!x.isHidden()) System.out.println("FFF - " + sp + " " + x.getName());
                }
            }
            vf.remove(vf.firstElement());
            s.remove(s.firstElement());
        }
    }
}