import java.io.*;
import java.net.*;


public class Epp1{
   public static void main(String argumendid[]) throws IOException{
   ServerSocket ss=new ServerSocket(3001);
     while(true){
     new Epuloim(ss.accept());
     }
   }
}
class Epuloim extends Thread{
Socket sc;
   public Epuloim(Socket usc){
   sc=usc;
   start();
   }
     public void run(){
       try{
       PrintWriter valja=new PrintWriter(sc.getOutputStream(), true);
        BufferedReader sisse=new BufferedReader(
         new InputStreamReader(sc.getInputStream()));
        valja.println("Nimi palun!");
        String nimi=sisse.readLine();
        System.out.println(nimi);
        boolean olemas=false;        
        BufferedReader s1=new BufferedReader(new FileReader("nimed.txt"));
      String  rida=s1.readLine();
        while(rida!=null){
          if(nimi.equals(rida))olemas=true;
          rida=s1.readLine();
        }
        s1.close();
 if (!olemas){
 PrintWriter faili=new PrintWriter(new FileWriter("nimed.txt", true));
                        faili.println(nimi);
                        faili.close();
}                   
     sc.close();
       }catch(Exception e){
        System.out.println("Probleem "+e);
       }
     }
    }