#include<stdio.h>
#include<string.h>
#include<ctype.h>
void solve(){
    char str1[12];
    char str2[12];
    int count1[26]={0};
    int count2[26]={0};
    int len1,len2;
    int i;
    if(scanf("%11s",str1)!=1){
        printf("Invalid Input\n");
        return;
    }
    if(scanf("%11s",str2)!=1){
        printf("Invalid Input\n");
        return;
    }
    len1=strlen(str1);
    len2=strlen(str2);
    
    if(len1<1||len1>10||len2<1||len2>10){
        printf("Invalid Input\n");
        return;
    }
    if(len1!=len2){
        printf("NO\n");
        return;
    }
    for(i=0;i<len1;i++){
        if(!isalpha(str1[i])){
            printf("Invalid Input\n");
            return;
        }
        if(isupper(str1[i])){
            count1[str1[i]-'A']++;
        }else{
            count1[str1[i]-'a']++;
        }
    }
    for(i=0;i<len2;i++){
        if(!isalpha(str2[i])){
            printf("Invalid Input\n");
            return;
        }
        if(isupper(str2[i])){
            count2[str2[i]-'A']++;
        }
        else{
            count2[str2[i]-'a']++;
        }
    }
    for(i=0;i<26;i++){
        if(count1[i]!=count2[i]){
            if(count1[i]!=count2[i]){
                printf("NO\n");
                return;
            }
        }
        printf("YES\n");
    }
int main() {
          solve();
          return 0;
}