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