#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <stdio.h>

using namespace std;

int main(void)
{
	char c;
	vector<char> A, B;
	while ((c = getchar()) != '\n') {
		A.push_back(c);
	}
	while ((c = getchar()) != '\n') {
		B.push_back(c);
	}
	sort(A.begin(), A.end());
	sort(B.begin(), B.end());
	if (A == B) {
		cout << "YES" << endl;
	} else {
		cout << "NO" << endl;
	}
}