#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main() {
    char s1[20], s2[20];
    scanf("%s", s1);
    scanf("%s", s2);
    if (strlen(s1) < 1 || strlen(s1) > 10 || strlen(s2) < 1 || strlen(s2) > 10){
       {
           printf("Invalid input");
        return 0;
    }
    for(int i = 0; s1[i]; i++) {
    if (!isalpha(s1[i])) {
        printf("Invalid input");
        return 0;
    }    
    }
    for(int i = 0;s2[i]; i++) {
    if (!isalpha(s2[i])) {
      printf("Invalid input");
      return 0;
      
    }   
    }
    if (strlen(s1) !=strlen(s2)) {
        printf("NO");
        return 0;
    }
        for (int i = 0; s1[i]; i++) s1[i] =tolower(s1[i]);
        for (int i= 0; s2[i]; i++) s2[i] = tolower(s2[i]);
        for (int i= 0; i < strlen(s1) - 1;i++) {
            for (int j = i + 1; j<strlen(s1); j++) {
              if (s1[i] > s1[j]) {
                 char t =s1[j];
                 s1[i] = s1[j];
                 s1[j] =t;
            }
            if (s2[i] > s2[j]) {
                char t =s2[j];
                s2[i] = s2[j];
                s2[j] =t;
            }
        
        }
    }
    if (strcmp(s1, s2) == 0)
    printf("YES");
    else
    printf("NO");
    return 0;
 }