import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class No69 {
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		char[] chrA = br.readLine().toCharArray(); //一文字ずつ分割して配列に入れる
		char[] chrB = br.readLine().toCharArray();
		Arrays.sort(chrA); //アルファベットをソートする
		Arrays.sort(chrB);
		
		int count = 0;
		for (int i = 0; i < chrA.length; i++){
			if(Arrays.equals(chrA, chrB)) count++; //配列の一致確認はArrays.equals(x,y)
		}
		    if (count == chrA.length) System.out.println("YES"); //全部一致ならYES
			else System.out.println("NO");
	}
}