import java.util.*;

public class Main {
	public static void main(String[] args) {

		int o,p,q;
		int a = 0, b = 0;
		
		Scanner sc  = new Scanner(System.in);
//		int[] test  = new int[100000];
//  		int[] test2 = new int[1000];
	  String str1 = sc.next();
	  String str2 = sc.next();
	  char[] c1=str1.toCharArray();
	  char[] c2=str2.toCharArray();
	  Arrays.sort(c1);
	  Arrays.sort(c2);
	  
	 /*   
	  int	s = Integer.parseInt(sc.next());
	  int	t = Integer.parseInt(sc.next());
	  int	u = Integer.parseInt(sc.next());
		*/

		
  /*
    int d = 0;
		while(true){
		
       int	v = Integer.parseInt(sc.next());
       test2[d] = v ;
     	d++;
		}
		
		*/

	  for(int i=0;i<c1.length;i++){
			if(c1[i]!=c2[i]){
				System.out.println("NO");
				return;
			}
		}
		System.out.println("YES");
	
		  System.out.println();
	}
}