#include <iostream>
//#include <vector>
#include <algorithm>
//#include <string>
//#include <cmath>
//#include <iomanip>
	//cout << fixed << setprecision(桁数);

using namespace std;

int main()
{
	string A, B;
	cin >> A >> B;

	bool able = true;

	if (A.length() == B.length())
	{
		sort(A.begin(), A.end());
		sort(B.begin(), B.end());

		for (int i = 0; i < A.length(); i++)
		{
			if (A[i] != B[i])
			{
				able = false;
			}
		}
	}
	else
	{
		able = false;
	}

	cout << (able ? "YES" : "NO") << endl;

	return 0;
}