import java.io.*;
import java.util.Arrays;
public class No69 {
	public static void main(String[] args) {
		try(BufferedReader input = new BufferedReader(new InputStreamReader(System.in))){
			String A= input.readLine();
			String B= input.readLine();
			char H_A[] =new char[10];
			char H_B[] =new char[10];
			boolean unmatch=false;
			if(A.equals(B))
				System.out.println("YES");
			else{
				H_A=A.toCharArray();
				Arrays.sort(H_A);
				H_B=B.toCharArray();
				Arrays.sort(H_B);
				for(int i=0;i<H_A.length;i++){
					if(H_A[i]!=H_B[i]){
						unmatch=true;
						break;
					}
				}
				if(unmatch==false)
					System.out.println("YES");
				else
					System.out.println("NO");
			}
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}