use proconio::input;

fn main() {
    input! {
        mut a: i32,
        mut b: i32,
    };
    while a >= 0 && b >= 0 {
        if a % 10 < b % 10 {
            println!("No");
            return;
        }
        a /= 10;
        b /= 10;
    }
    println!("Yes");
}