#include <stdio.h>
#include <string.h>
#include <ctype.h>
int is_anagram(char*s1, char*s2){
    int count[26]={0};
    for(int i=0;s1[i];i++)count[s1[i]-'a']++;
    for(int i=0;s2[i];i++)count[s2[i]-'a']--;
    for(int i=0;i<26;i++)if(count[i])return 0;
    return 1;
}
int main(){
    char s1[MAX],s2[MAX];
    fgets(s1,MAX,stdin);
    fgets(s2,MAX,stdin);
    s1[strcspn(s1,"\n")]=0;
    s2[strcspn(s2,"\n")]=0;
    if(strlen(s1)!=strlen(s2)) printf("NO\n");
    else if(is_anagram(s1,s2)) printf("YES\n");
    else printf("NO \n");
    return 0;
    
}