#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main () {
    char str1[20], str2[20];
    int count1[26] = {0}, count2[26] = {0};
    
    if (scanf("%s %s", str, str2) !=2) {
        printf("invalid input");
        return 0;
    }
    
    int len1 = strlen(str1), len2 = strlen(str2);
    
    if (len1 < 1 || len1 > 10 || len2 < 1 || len2 > 10) {
        printf("invalid input");
        return 0;
    }
    
    for (int i = 0; i < len1; i++)
        if (!isalpha(str1[i])) {
            printf("invalid input");
            return 0;
        }
    
    for (int i = 0; i < len2; i++)
        if (!isalpha(str2[i])) {
            printf("invalid input");
            return 0;
        }
        
    if (len1 != len2) {
        printf("NO");
        return 0;
    }
    
    for (int i = 0; i < len1; i++) {
        count1[tolower(str1[i]) - 'a']++;
        count2[tolower(str2[i]) - 'a']++;
    }
    
    for (int i = 0; i < len1; i++) {
        if (count1[i] != count2[i]) {
            printf("NO");
            return 0;
        }
    }
    
    printf("YES");
        return 0;
}