import java.io.*;
import java.net.*;
public class TalkServer
{
	public static void main(String args[]) 
	{
		try
		{
			ServerSocket server=null;
			try
			{	
			     server=new ServerSocket(4701);
			}
			catch(Exception e) 
			{
				System.out.println("can not listen to:"+e);   
			}
			Socket socket=null;
			try
			{
				socket=server.accept();
			}
			catch(Exception e) 
			{
				System.out.println("Error."+e);
			}
	
			String readline;
			BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
			PrintWriter os=new PrintWriter(socket.getOutputStream());
			BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
			System.out.println("Client:"+is.readLine());
			readline=sin.readLine();
	
			while(!readline.equals("bye"))
			{
				os.println(readline);
				os.flush();
				System.out.println("Server:"+readline);
				System.out.println("Client:"+is.readLine());
				readline=sin.readLine();
			}
			os.close();
			is.close();
			socket.close();
			server.close();
		}
		catch(Exception e)
		{
			System.out.println("Error:"+e);
		}
	}
}