#include <iostream>
#include <string>
#include <algorithm>

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;
	}
}