#include<stdio.h>
#include<string.h>
#include<ctype.h>
#define MAX_LEN 100
#define ALPHABET_SIZE 26

int areAnagrams(char *str1, char*str2){
    int count1[ALPHABET_SIZE]={0}, count2[ALPHABET_SIZE] = {0};
    int i;
    
    int len1=strlen(str1);
    int len2=strlen(str2);
    
    for(i=0;i<len1; i++){
        if (!isalpha(str1[i])) return -1;
        count1[tolower(str1[i]) - 'a']++;
    }
    for (i =0; i< len2; i++){
        if(!isalpha(str2[i])) return -1;
        count2[tolower(str2[i]) - 'a']++;
    }
    if (len1 != len2) return 0;
    for(i=0;i<ALPHABET_SIZE; I++){
        if(count1[i] != count1[i])return 0;
    }
    return 1;
}
int main(){
    char str1[max_len],str2[max_len];
    if(scanf("%s %s", str1, str2)!=2){
        printf("Invalid input\n");
        return 1;
    }
    int result = areAnagrams(str1, str2);
    if(result== -1){
        printf("Invalid input\n");
    }
    else if(result ==1){
        printf("YES\n");
    }
    else{
        printf("NO\n");
    }
    return 0;
}