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