#include <iostream>
#include <algorithm>

using namespace std;

int main() {
	char a[15], b[15],i;
	int ans=0;
	cin >> a >> b;
	sort(a,a+9);
	sort(b, b + 9);
	for (i = 0; i < 10; i++) {
		if (a[i] != b[i]) 
			ans=1;
	}
	if (ans)
		cout << "NO\n";
	else
	cout << "YES\n";
	return 0;
}