#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(srtlen(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[i];
              s1[i] = s1[j];
              s1[j] = t; 
          }
          if(s2[i] > s2[j]) {
              char t = s2[i];
              s2[i] = s[j];
              s2[j] = t; 
          }
          
          }
      }
      if(strcmp(s1 , s2) == 0)
      printf("YES");
      else
      printf("NO");
      return 0;
}

    
}