#include<iostream>

#include<stdio.h>

#include<algorithm>

using namespace std;

int funct(string s,string t,int len){

int res = 0;

for(int i=0,j=len-1;i<len&&j>=0;i++,j--){

if(s[i]!=t[j]) return -1;

}

return 1;

}

int div(string s,string t,int len){

if(len == 1){

if(s==t) return 1;

else return -1;

}

int a= len/2;

int b = len - len/2;

string s1 = s.substr(0,a);

string s2 = s.substr(a,b);

string t1 = t.substr(0,b);

string t2 = t.substr(b,a);

cout<<s1<<" "<<s2<<" "<<t1<<" "<<t2<<endl;

int ret = 0;

ret = div(s1,t2,a);

if(ret == -1) return -1;

ret = div(s2,t1,b);

if(ret == -1) return -1;

return 1;

}

string small(string s){

if(s.length()%2==1) return s;

string s1 = small(s.substr(0,s.length()/2));

string s2 = small(s.substr(s.length()/2,s.length()));

//cout<<s1<<" "<<s2<<endl;

if(s1<s2) return s1+s2;

return s2+s1;

}

int main(){

// accepted

string s1,s2;

cin>>s1;

cin>>s2;

//int l = s1.size();

//int r = div(s1,s2,l);

string t1 = small(s1);

string t2 = small(s2);

//sort(s1.begin(),s1.end());

// sort(s2.begin(),s2.end());

if(t1==t2){

printf("YES\n");

}

else{

printf("NO\n");

}

}