import java.util.Scanner;
import java.util.Arrays;

class Test {
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(System.in);

		char[] a = in.next().toCharArray();
		char[] b = in.next().toCharArray();

		Arrays.sort(a);
		Arrays.sort(b);
		boolean bool = true;

		for(int i=0; i<a.length; i++) {
			if(a[i] != b[i]) {
				bool = false;
			}
		}

		if(bool) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
}