use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn get_word<T: FromStr>() -> T {
    (&get_line()).parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split('.').map(|x| x.parse().ok().expect("parse error.")).collect()
}

fn main() {
    let a = get_vec::<u64>();
    let b = get_vec::<u64>();
    println!("{}", if comp(&a, &b) {"YES"} else {"NO"});
}

fn comp(a: &Vec<u64>, b: &Vec<u64>) -> bool {
    for i in 0..a.len() {
        if a[i] != b[i] {
            return a[i] > b[i];
        }
    }
    true
}