#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(){
    char str1[20], str2[20];
    int count1[26] = {0},count2[26] = {0};
    scanf("%s", str1);
    scanf("%s", str2);
    int len1 = strlen(str1):
    int len2 = strlen(str2);
    if (len1 < 1 || len2 < 1 || len1 > 10 || len2 > 10 || len1 != len2){
        printf ("Invalid input");
        return 0;
    }
    for (int i=0;i<len1;i++){
        if(!isalpha(str1[i]) || !isalpha(str2[i])){
            printf("Invalid input");
            return 0;
        }
        count1[tolower(str1[i]) - 'a']++;
        count2[tolower(str2[i]) - 'a']++;
        
    }
    for (int i=0;i<26;i++){
        if(count1[i] != count2[i]){
            printf("NO");
            return 0;
        }
    }
    printf("YES");
    return 0;
}