import java.io.*;
import java.net.*;
class TCPServer {
    public static void main(String argv[]) throws Exception
    {
        String clientSentence;
        String capitalizedSentence;
        ServerSocket welcomeSocket = new ServerSocket
            (6789);
        
        while(true) {
            Socket connectionSocket = welcomeSocket.
                accept();
            BufferedReader inFromClient =
                new BufferedReader(new InputStreamReader
                    (connectionSocket.getInputStream()));
            DataOutputStream outToClient =
                new DataOutputStream
                    (connectionSocket.getOutputStream());
            clientSentence = inFromClient.readLine();
            capitalizedSentence = 
                clientSentence.toUpperCase() + '\n';
            outToClient.writeBytes(capitalizedSentence);
            connectionSocket.close();
        }
    }
}