import java.io.*;
import java.net.*;
import java.util.Scanner;
public class Server{
    public static void main(String argv[]) throws Exception
{
/*1.connection*/
ServerSocket serverSocket = new ServerSocket(6789);
Socket connectionSocket = serverSocket.accept();
/*2. reading from the socket using scanner or BufferedReader*/
Scanner scanner = new Scanner(connectionSocket.getInputStream());
//read
String clientSentence = scanner.nextLine();
System.out.println("Received: " + clientSentence);
/*3. modification of the sentence*/
String modifiedSentence =clientSentence.toUpperCase();
/*4. writing in the socket*/
DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
outToClient.writeBytes(modifiedSentence+ 'n');
scanner.close();
connectionSocket.close();}}