#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>

using namespace std;

int main() {

	string A, B;
	cin >> A >> B;

	int ala[26] = {}, alb[26] = {};

	bool flag = true;
	for (int i = 0; i < A.size(); i++) {
		ala[A[i] - 'a']++;
		alb[B[i] - 'a']++;
	}

	for (int i = 0; i < 26; i++) {
		if (ala[i] != alb[i]) flag =false;
	}

	if (flag) cout << "YES" << endl;
	else cout << "NO" << endl;

	return 0;
}