import java.net.Socket;
import java.net.ServerSocket;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class ReverseServer {
    public static void main (String[] args) {
	try {
	    ServerSocket ssock = new ServerSocket (port, max_conn);

	    while (true) {
		Socket sock = ssock.accept(); // accept() blocks

		InputStreamReader isr = new InputStreamReader (sock.getInputStream());
		BufferedReader in = new BufferedReader (isr);
		String req = in.readLine(); // blocks

		String res = new StringBuffer(req).reverse().toString();
		PrintWriter out = new PrintWriter (sock.getOutputStream());
		out.println (res);
		out.flush();
	 
		sock.close();
	    }
	}
	catch (IOException e) {
	    System.err.println(e);
	}
    }

    private static final int port = 9876;
    private static final int max_conn = 1;
}