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

class UDPClient {
   public static void main(String args[]) throws Exception
   {
      BufferedReader inFromUser =
         new BufferedReader(new InputStreamReader
                     (System.in));

      DatagramSocket clientSocket = new DatagramSocket();

      InetAddress IPAddress = 
                      InetAddress.getByName("localhost");

      byte[] sendData = new byte[1024];
      String sentence = inFromUser.readLine();
      while (sentence != null) {
         byte[] receiveData = new byte[1024];
         sendData = sentence.getBytes();
         DatagramPacket sendPacket =
            new DatagramPacket(sendData, sendData.length, 
                      IPAddress, 6789);
//         System.out.println("TO SERVER:" + sentence + sendData.length);
         clientSocket.send(sendPacket);
         DatagramPacket receivePacket =
            new DatagramPacket(receiveData,
                      receiveData.length);
         clientSocket.receive(receivePacket);
         String modifiedSentence =
            new String(receivePacket.getData());
         System.out.println("FROM SERVER:" +
                         modifiedSentence);
         sentence = null;
         sentence = inFromUser.readLine();
      }

      clientSocket.close();
   }
}