fn read() -> usize {
    let mut buf: String = String::new();
    std::io::stdin().read_line(&mut buf).unwrap();
    buf.trim().parse().unwrap()
}

fn solve(n: usize) -> &'static str {
    if (10..=99).contains(&n) {
        "Yes"
    } else {
        "No"
    }
}

fn main() {
    println!("{}", solve(read()));
}