use std::io::Write;
use std::net::{TcpListener, TcpStream};
use std::io::prelude::*;

fn main() -> std::io::Result<()> {
    let listener = TcpListener::bind("0.0.0.0:8000")?;
    for stream in listener.incoming() {
        println!("Client connected!");
        stream?.write(b"HELO");
    }
    Ok(())
}