import java.io.*;

import java.net.*;

class ReverseServer

{

public static void main(String argv[]) throws Exception

{

String clientSentence;

ServerSocket welcomeSocket = new ServerSocket(9999);

while(true)

{

Socket connectionSocket = welcomeSocket.accept();

BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));

DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());

clientSentence = inFromClient.readLine();

String sendToClient = new StringBuilder(clientSentence).reverse().toString()+'\n';

outToClient.writeBytes(sendToClient) ;

}

}

}