#include <algorithm>
#include <cstring>
#include <iostream>

using namespace std;

int main(int argc, const char *argv[])
{
	string A, B;
	cin >> A >> B;
	const char *a = A.c_str();
	const char *b = B.c_str();
	sort((char *)a, (char *)&a[A.size()]);
	sort((char *)b, (char *)&b[B.size()]);
	cout << (strcmp(a, b) == 0 ? "YES" : "NO") << endl;
	return 0;
}