#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main() {
    char s1[20], s2[20];
    scanf("%s", s1);
    scanf("%s", s2);
    if(streln[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; 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]=s2[j]=s2[j]; s2[j]=t; }
        }
    if(strcmp(s1, s2) == 0)
       printf("YES");
    else printf("NO");
    return 0;
}