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