import java.io.*;
import java.net.Socket;
import java.util.StringTokenizer;

public class Client
{
    public static Boolean PWD(PrintWriter writer, BufferedReader br) throws IOException
    {
        String str = new String();
        writer.println("PWD");
        str = br.readLine();
        if(str.substring(0,3).equals("257")){
            System.out.println("PWD : "+str.substring(3));
            return true;
        }
        return false;
    }

    public static Boolean CWD(PrintWriter writer, BufferedReader br) throws IOException
    {
        String str = new String();
        writer.println("CWD "+"WinXp");
        str = br.readLine();
        //System.out.println(str);
        if(str.substring(0,3).equals("250")){
            System.out.println(str.substring(3));
            return true;
        }
        return false;
    }

    public static Boolean PASV(PrintWriter writer, BufferedReader br) throws IOException
    {
        String str = new String();
        int j=0;
        String tabString[]=new String[5];
        writer.println("PASV"+str);
        str = br.readLine();
        StringTokenizer ip = new StringTokenizer(str, "(), ABCDEFGHIJKLMOPQRSTUVWXYZabcdefghijklmnopkrstuvwxyz");
        //ABCDEFGHIJKLMOPQRSTUVWXYZabcdefghijklmnopkrstuvwxyz

        for(int i=0;i<3;i++){
            ip.nextToken();
        }
        while(ip.hasMoreTokens())
        {
            tabString[j]=ip.nextToken();
            System.out.print(tabString[j]+".");
            j++;
        }
        if(str.substring(0,3).equals("227")){
            System.out.println(str.substring(3));
            return true;
        }
        return false;
    }

    public static Boolean QUIT(PrintWriter writer, BufferedReader br) throws IOException
    {
        String str = new String();
        writer.println("QUIT");
        str = br.readLine();
        if(str.substring(0,3).equals("221")){
            System.out.println(str.substring(3));
            return true;
        }
        return false;
    }


    public static Boolean connexion(PrintWriter writer, BufferedReader br) throws IOException
    {
        BufferedReader entree = new BufferedReader(new InputStreamReader(System.in));
        String str = new String();
        //String user = "e20703933";
        //String pass = "pemeenam1";
        String response = new String();
        response = br.readLine();
        System.out.println(response.substring(0, 3));
        if(response.substring(0,3).equals("220"))
        {
            System.out.print("Username : ");
            str = entree.readLine();
            writer.println("USER "+str);
            response = br.readLine();
            if(response.substring(0,3).equals("331"))
            {
                System.out.print("Password : ");
                str = entree.readLine();
                writer.println("PASS "+str);
                response = br.readLine();
                //System.out.print(response);
                if(response.substring(0,3).equals("230"))
                {
                    System.out.println("Connection successfull !");
                    return true;
                }
                System.out.println("Wrong password");
                return false;

            }
            return false;
        }
        System.out.println(response);
        return false;
    }

    public static void main(String [] args) {
        System.getProperties().put("http.proxyHost", "proxyubo.univ-brest.fr");
        System.getProperties().put("http.proxyPort", "3128");

        try{

            String addr = "stockage.univ-brest.fr";
            Socket sock = new Socket(addr,21);

            PrintWriter writer = new PrintWriter(
                      new BufferedWriter(
                         new OutputStreamWriter(sock.getOutputStream())),
                      true);

            BufferedReader br = new BufferedReader(
                    new InputStreamReader(sock.getInputStream())
                    );

            if(connexion(writer,br)){
                if(PWD(writer,br))
                {
                    if(CWD(writer,br))
                    {
                        if(PWD(writer,br))
                        {
                            if(PASV(writer,br)){
                                QUIT(writer,br);
                            }
                        }
                    }
                }
            }


            writer.println("END") ;
            br.close();
            writer.close();
            sock.close();

        }catch (IOException ioe){}
    }

}