use proconio::input;

fn main() {
	input! {
		a: String,
		b: String,
	}

	let mut s: Vec<char> = a.chars().collect();
	let mut t: Vec<char> = b.chars().collect();

	s.sort();
	t.sort();

    let ans = if s == t {
        "YES"
    } else {
        "NO"
    };

	println!("{ans}");
}