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

public class Server{
	public static void main(String args[])throws Exception
	
	{
	
		String clientSentence;
	
		ServerSocket welcomeSocket = new ServerSocket (8000);
	
		while(true){
			        System.out.println("Server listening!");
				Socket connectionSocket = welcomeSocket.accept();
				
				BufferedReader inFromClient = new BufferedReader(new InputStreamReader(
				
						        	connectionSocket.getInputStream()));
				
				DataOutputStream outToClient =new DataOutputStream(connectionSocket.getOutputStream());
				
				clientSentence = inFromClient.readLine();
				
				System.out.println(clientSentence+"received!");;
						
				outToClient.writeBytes("ACK"+ '\n');
				
					  
						        	                	
			   }
	}

}