#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
	char a[10], b[10],i;
	cin >> a >> b;
	sort(a,a+9);
	sort(b, b + 9);
	for (i = 0; i < 10; i++) {
		if (a[i] != b[i]) {
			cout << "NO\n";
			return 0;
		}
	}
		cout << "YES\n";
		return 0;
}