#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(){
    char str1[20], str2[20];
    int len1, len2, i, j;
    int freq1[26] = {0}, freq2[26] = {0};
    scanf("%s", str1);
    scanf("%s", str2);
    len1 = strlen(str1);
    len2 = strlen(str2);
    if(len1 < 1 || len1 > 10 || len2 < 1 || len2 > 10){
        printf("Invalid input\n");
        return 0;
    }
    for (i = 0; i < len1; i++){
        if (!isaplha(str1[i])){
            printf("Invalid input\n");
            return 0;
        }
    }
    for (i = 0; i < len2; i++){
        if (!isaplha(str2[i])){
            printf("Invalid input\n");
            return 0;
        }
    }
    if (len1 != len2){
        printf("NO\n");
        return 0;
    }
    for (i = 0; i < 26; i++){
       if (freq1[i] != freq2[i]){
            printf("NO\n");
            return 0;
        }
    }
    printf("YES\n");
    return 0;
}