fn main() {
    let mut input_a = String::new();
    let _ = std::io::stdin().read_line(&mut input_a);
    let mut input_a = input_a.trim();

    let mut input_b = String::new();
    let _ = std::io::stdin().read_line(&mut input_b);
    let mut input_b = input_b.trim();

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