import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone{
    public static void main(String[] args) throws Exception{
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        if(s.length()!=t.length()){
            System.out.println("NO");
            return;
        }
        HashMap<Character,Integer> map = new HashMap<Character,Integer>();
        for(int i=0;i<s.length();i++){
            char c = s.charAt(i);
            map.put(c,map.containsKey(c)?map.get(c)+1:1);
        }
        for(int i=0;i<t.length();i++){
            char c = t.charAt(i);
            if(!map.containsKey(c)){
                System.out.println("NO");
                return;
            }
            int n = map.get(c);
            if(n==0){
                System.out.println("NO");
                return;
            }
            map.put(c,n-1);
        }
        System.out.println("YES");
    }
}