use std::io::{self, BufReader, BufWriter, BufRead, Read, Write};

fn main () {
    let mut stdin = BufReader::new(io::stdin());
    let mut bw = BufWriter::new(io::stdout());

    loop {
        let buf = stdin.fill_buf().unwrap();
        let len = buf.len();
        if len == 0 {
            break;
        }
        bw.write(&buf).unwrap();
        stdin.consume(len);
    }
    bw.flush().unwrap();
}