import java.io.*;
import java.net.*;
public class Tripsuserver{
  static final int pordinr=3001;
  static final String masin="ws11.cs3.tpu.ee";
  static final String lopp=".ots";
  public static void main(String argumendid[]) throws Exception{
    ServerSocket ss=new ServerSocket(Tripsuserver.pordinr);
    while(true){
      Socket sc1=ss.accept();
       new DataOutputStream(sc1.getOutputStream()).writeBytes(".margiksX "+
                                                    "Oota paarilist");
       System.out.println("Esimene");
      Socket sc2=ss.accept();
       new DataOutputStream(sc2.getOutputStream()).writeBytes(".margiks0");
       System.out.println("Teine");
      new Tripsuloim(sc1, sc2);

    }
  }
}

class Tripsuloim extends Thread{
  Socket[] sc=new Socket[2];
  public Tripsuloim(Socket usc1, Socket usc2){
    sc[0]=usc1;
    sc[1]=usc2;
    start();
  }
  public void run(){
    try{
       DataInputStream sisse[]=new DataInputStream[2];
       DataOutputStream valja[]=new DataOutputStream[2];
       for(int i=0; i<2; i++){
         sisse[i]=new DataInputStream(sc[i].getInputStream());
         valja[i]=new DataOutputStream(sc[i].getOutputStream());
       }
       valja[0].writeBytes(".kaikVaba");
       boolean veel=true;
       while(veel){
         String vastus=sisse[0].readLine();
         kirjuta(valja, vastus);
         if(!vastus.equals(Tripsuserver.lopp)){
            vastus=sisse[1].readLine();
            kirjuta(valja, vastus);
         }
         if(vastus.equals(Tripsuserver.lopp))veel=false;
       }
       for(int i=0; i<2; i++){
         sc[i].close();
       }
    }catch(Exception e){
      System.out.println("Probleem:"+e);
    }
  }
  private void kirjuta(DataOutputStream[] pw, String teade){
    for(int i=0; i<pw.length; i++){
      try{pw[i].writeBytes(teade+"\n");}catch(Exception e){}
      System.out.println(teade);
    }
  }
}