# 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; 1 < 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]=s2[j]=s2[j]; s2[j]=t; }
         }
    if(strcmp(s1, s2) == 0)
      printf("YES");
     else printf("NO");
     return 0;
}
        
}
}