import javax.imageio.*;
import java.awt.image.*;
import java.awt.*;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
import java.lang.reflect.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.util.regex.*;
import java.util.List;
import java.util.zip.*;
import java.util.*;
public class main {
  public static void main(String[] args) throws Exception {


String dirToList = ".";
File d = new File(dirToList);
if (d.isDirectory()) {
  for (File f : d.listFiles()) {
    boolean isDir = f.isDirectory();
    System.out.println((isDir ? "D" : "F") + " " + f.getName());
  }
}
  }
}