#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main()
{
	string  a, b;
	getline(cin, a);
	getline(cin, b);
	sort(a.begin(), a.end());
	sort(b.begin(), b.end());
	cout << (a == b ? "YES" : "NO") << endl;
	return 0;
}