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

using namespace std;

int main()
{
	string A, B;

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


	return 0;
}