use std::io;

fn main() {
    let n: Vec<i32> = read_input();

    if 10 <= n[0] && n[0] <= 99 {
        println!("Yes");
    } else {
        println!("No");
    }
}

fn read_input() -> Vec<i32> {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    let mut v: Vec<i32> = Vec::new();
    for i in s.trim().split_whitespace() {
        v.push(i.parse().unwrap())
    }
    v
}