#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap
#include <cstdlib>	//abs(int)

using namespace std;

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;

}