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

public class Crawler {
	public static void main(String[] args) {
		Scanner console = new Scanner(System.in);
		System.out.print("directory or file name? ");
		String name = console.nextLine();
		File f = new File(name);
		if (!f.exists()) {
			System.out.println("That file or directory does not exist");
		} else {
			print(f);
		}
	}

	// Prints the name of the given file. If the file is a directory,
	// recursively prints its content.
	// pre: f.exists()
	public static void print(File f) {
		if (!f.isDirectory()) {
			System.out.println(f.getName());
		} else {
			System.out.println(f.getName());
			File[] files = f.listFiles();
			for (int i = 0; i < files.length; i++) {
				print(files[i]);
			}
		}
	}
}