import java.util.Scanner;

public class Practice {
    public static void main(String args[]){
        Scanner scanner=new Scanner(System.in);
        String A=scanner.next(),B=scanner.next();
        String alphabet="abcdefghijklmnopqrstuvwxyz";
        int[] Amatch=new int[alphabet.length()],Bmatch=new int[alphabet.length()];
        for(int i=0;i<alphabet.length();i++){
            Amatch[i]=0;
            Bmatch[i]=0;
        }
        for(int i=0;i<A.length();i++){
            for(int j=0;j<alphabet.length();j++){
                if(A.charAt(i)==alphabet.charAt(j)){
                    Amatch[j]++;
                }
                if(B.charAt(i)==alphabet.charAt(j)){
                    Bmatch[j]++;
                }
            }
        }
        for(int i=0;i<alphabet.length();i++){
            if(Amatch[i]!=Bmatch[i]){
                System.out.println("NO");
                return;
            }
        }
        System.out.println("YES");
    }
}