use std::io::{self, BufRead};

fn main() {
    let input = io::stdin()
        .lock()
        .lines()
        .map(std::result::Result::unwrap)
        .collect::<Vec<_>>();

    let mut s1 = input[0].chars().collect::<Vec<_>>();
    s1.sort_unstable();
    let mut s2 = input[1].chars().collect::<Vec<_>>();
    s2.sort_unstable();

    if s1 == s2 {
        println!("YES");
    } else {
        println!("NO");
    }
}