#include<iostream>
#include<string>
#include<algorithm>
#include<utility>
using namespace std;
int main(void){
	string s,t;
	cin>>s>>t;
	if(s.size()!=t.size()){
		cout<<"NO"<<endl;
	}
	char ss[s.size()],tt[t.size()];
	s.copy(ss,s.size());
	t.copy(tt,t.size());
	sort(ss,ss+s.size());
	sort(tt,tt+t.size());
	for(int i=0;i<t.size();i++)
		if(ss[i]!=tt[i]){
			cout<<"NO"<<endl;
			return 0;
		}
	cout<<"YES"<<endl;
	return 0;
}