import java.util.*;
class No69{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int count = 0;
		
		String str1 = sc.next(); char[] c1 = str1.toCharArray();
		String str2 = sc.next(); char[] c2 = str2.toCharArray();
		
	    if(c1.length == c2.length){
			for(int i=0; i<str1.length(); i++){
				for(int j=0; j<str2.length(); j++){
					if(c1[i] == c2[j]){
						c1[i] = '0';
						c2[i] = '0';
					}
				}
				System.out.println(c1[i]);
			}
	    }
		
		for(int i=0; i<str1.length(); i++){
			if(c1[i] == '0'){
				count++;
			}
		}
		
		if(count == str1.length()){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}