public   class  Client
{
	 public   static   void  main(String args[])
	{
		String  str,
                res;
		 boolean  exit = false;
		System.out.println("Socket Client Application");
        System.out.println("---- Start ----");
		 try 
		{
			BufferedReader stdin = new  BufferedReader( new  InputStreamReader(System.in));
            Socket s =  new  Socket("localhost", 2000 );
			DataInputStream dataIn =  new  DataInputStream( new  BufferedInputStream(s.getInputStream()));
			DataOutputStream dataOut =  new  DataOutputStream( new  BufferedOutputStream(s.getOutputStream()));
			// ввод команд серверу
			 while (!exit)
			{
				System.out.println("Enter a string:");
				str = stdin.readLine();
                System.out.print("["+str+ " <> ");
				 if (!str.equals("exit"))
				{
					dataOut.writeUTF(str);
					dataOut.flush();
				}
				 else 
				{
					dataOut.writeUTF("exit");
					dataOut.flush();
					exit = true;
				}
                res = dataIn.readUTF();
                System.out.println(res+"]");
			}
			dataIn.close();
			dataOut.close();
			s.close();
		}
		 catch (IOException ioe)
		{
            System.out.println(ioe.toString());
		}
	}
}

 class  Server
{
	 public   static   void  main(String args[])
	{
		String  str,
                rev;
         int  r;
		 boolean  exit = false;
		System.out.println("Socket Server Application");
		System.out.println("---- Start ----");
		 try 
		{
			ServerSocket ss =  new  ServerSocket( 2000 );
			Socket s = ss.accept();
			DataInputStream dataIn =  new  DataInputStream( new  BufferedInputStream(s.getInputStream()));
			DataOutputStream dataOut =  new  DataOutputStream( new  BufferedOutputStream(s.getOutputStream()));
			//обработка команд от клиента
			 while (!exit)
			{
				str = dataIn.readUTF();
				System.out.print(str);
				 if (str.equals("exit"))  break ;
				r = str.length()- 1 ;
                rev="";
                 for  ( int  i =  0 ; i < str.length(); i++)
				{
					rev+=str.toCharArray()[r-i];
				}
                System.out.println(" > "+rev);
                dataOut.writeUTF(rev);
				dataOut.flush();

			}
			dataIn.close();
			dataOut.close();
			s.close();
			ss.close();
		}
		 catch (IOException ioe)
		{
			System.out.println(ioe.toString());
		}
		System.out.println("---- Finish ----");
	}
}