import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        String X = scan.next();
        String Y = scan.next();

        if (X.length() < 1||X.length() > 10||
            Y.length() < 1||Y.length() > 10||
            X.length() != Y.length()) System.exit(1);
        char[] strX = X.toCharArray();
        char[] strY = Y.toCharArray();
        for (int i = 0; i < X.length(); i++) {
            if (Character.isUpperCase(strX[i])||Character.isUpperCase(strY[i])) System.exit(1);
        }

        Arrays.sort(strX);
        Arrays.sort(strY);
        for (int i = 0; i < X.length(); i++) {
            if (strX[i]!=strY[i]) {
                System.out.println("NO");
                System.exit(0);
            }
        }

        System.out.println("YES");
    }
}