import java.io.*;
import java.net.*;
public class MyServer {
    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(2343);
        while (true) {
            Socket sock = server.accept();
            InputStream in = sock.getInputStream();
            OutputStream out = sock.getOutputStream();
            while (true) {
                int read = in.read();
                if (read == -1) {  break;  }
                out.write(Character.toUpperCase((char)read));
            } 
        }
    }
}