#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
int main() {
	string A;
	string B;

	cin >> A;
	cin >> B;
	sort(A.begin(), A.end());
	sort(B.begin(), B.end());
	if(A==B){
		cout << "YES";
	}
	else {
		cout << "NO";
	}
	return 0;
}