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

#[derive(Debug)]
struct Input {
    a: String,
    b: String,
}

fn next_token(cin_lock: &mut io::StdinLock) -> String {
    cin_lock
        .by_ref()
        .bytes()
        .map(|c| c.unwrap() as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect::<String>()
}

fn read_input(cin_lock: &mut io::StdinLock) -> Input {
    Input {
        a: next_token(cin_lock),
        b: next_token(cin_lock),
    }
}

fn solve(input: Input, _cin_lock: &mut io::StdinLock) {
    let mut a = input.a.chars().collect::<Vec<_>>();
    a.sort();

    let mut b = input.b.chars().collect::<Vec<_>>();
    b.sort();

    println!("{}", if a == b { "YES" } else { "NO" });
}

fn main() {
    let cin = io::stdin();
    let mut cin_lock = cin.lock();

    let input = read_input(&mut cin_lock);
    solve(input, &mut cin_lock);
}