use proconio::{fastout, input};

#[fastout]
fn main() {
    input! {
        n: u16,
    }

    println!("{}", output(solve(n)))
}

fn solve(n: u16) -> bool {
    n >= 10 && n <= 99
}

fn output(ans: bool) -> &'static str {
    match ans {
        true => "Yes",
        false => "No",
    }
}