// editor4
#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char str1[11], str2[11];
    int count1[26] = {0}, count2[26] = {0};
    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;
    }
    for(int i=0;i<len1;i++){
        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;
}