#include <vector>
#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>

using namespace std;

int toint(string s){
	stringstream ss(s);
	int ret;
	ss >> ret;
	return ret;
}

int main(){
	string a,b;
	cin >> a >> b;
	sort(a.begin(),a.end());
	sort(b.begin(),b.end());
	if(a == b){
		cout << "YES" << endl;
	}else{
		cout << "NO"  << endl;
	}

	return 0;
}