#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char s1[15],s2[15];
    scanf("%s",s1);
    scanf("%s",s2);
    for(int i=0;s1[i]!='\0';i++){
        if(!isalpha(s1[i])){
            printf("Invalid input");
            return 0;
        }
    }
    for(int i=0;s2[i]!='\0';i++){
        if(!isalpha(s2[i])){
            printf("Invalid input");
            return 0;
        }
    }
    int l1=strlen(s1);
    int l2=strlen(s2);
    if(l1!=l2){
       printf("Invalid input");
       return 0;
    }
    int count[26]={0};
    for(int i =0;s1[i]!='\0';i++){
        tolower(s1[i]);
        count[(s1[i])-'a']++;
    }
    int count[26]={0};
    for(int i =0;s2[i]!='\0';i++){
        tolower(s2[i]);
        count[(s2[i])-'a']--;
    }
    if(count!=0){
        printf("NO");
    }
    else{
        printf("YES");
    }
    
}