#![allow(unused_macros, unused_imports)]
macro_rules! dbg {
    ($($xs:expr),+) => {
        #[cfg(debug_assertions)]
        std::dbg!($($xs),+)
    }
}

fn main() {
    proconio::input!{
        n: usize
    }

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