#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>
#define INF 1050000000

using namespace std;


int main(void)
{
	string a, b;
	int c, d;

	cin >> a >> b;

	sort(a.begin(), a.end());
	sort(b.begin(), b.end());
	
	if (a == b) cout << "YES" << endl;
	else		cout << "NO" << endl;

	return (0);
}