import java.util.Scanner;

public class No69 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String A = sc.next();
        String B = sc.next();
        int len = A.length();
        boolean[] c = new boolean[len];
        int index;

        for (int i = 0; i < len; i++) {
            for (int j = 0; j < len; j++) {
                if(A.charAt(i) == B.charAt(j) && !c[j]){
                    c[j] = true;
                    break;
                }else if(j == len - 1){
                    System.out.println("NO");
                    return;
                }
            }
        }
        System.out.println("YES");
    }
}