fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];
    let mut paths = vec![vec![]; n];
    for _ in 0..m {
        let mut temp = String::new();
        std::io::stdin().read_line(&mut temp).ok();
        let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let a = temp[0];
        let b = temp[1];
        paths[a].push(b);
        paths[b].push(a);
    }

    let mut used = vec![false; n];
    for i in (0..n).rev() {
        if used[i] { continue; }
        for &v in paths[i].iter() {
            if used[v] || v > i { continue; }
            used[v] = true;
        }
    }
    println!("{}", (0..n).rev().skip_while(|&i| !used[i]).map(|i| if used[i] { "1" } else { "0" }).collect::<Vec<_>>().join(""));
}