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

int main() {
    char str1[20], str2[20];
    
    if(scanf("%19s", str1) !=1) return 0;
    if(scanf("%19s", str2) !=1) return 0;
    
    int len1 = strlen(str1);
    int len2 = strlen(str2);
    
    if (len1 < 1 || len1 > 10 || len2 < 1 || len2 < 10) {
        printf("Invalid input");
        return 0;
    }
    
    for (int i = 0; i < len2; i++) {
        if (!isalpha((unsigned char)str2[i]))
        {
            printf("Invalid input");
            return 0;
        }
    }
    
    int (int i = 0; i < len2; i++) {
        if (!isalpha((unsingned char)str2[i]))
        {
            printf("Invalid input");
            return 0;
        }
    }
    
    if (len1 != len2) {
        printf("NO");
        return 0;
    }
    
    int count[20] = {0};
    for (int i = 0; i <len1; i++) {
        char c1 = tolower ((unsigned char)str1[i]);
        char c2 = tolower ((unsigned char)str2[i]);
        
        count[c1 - 'a']++;
        count[c2 - 'a']--;
    }
    
    for (int i = 0; i < 26; i++) {
        if (count[i] !=0) {
            printf("NO");
        }
    }
    
    printf("YES");
    return 0;
    
}