fn main() {
    let mut a: Vec<char> = read::<String>().chars().collect();
    let mut b: Vec<char> = read::<String>().chars().collect();
    a.sort();
    b.sort();
    if a == b {
        println!("YES");
    } else {
        println!("NO");
    }
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}