#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;
	string s1, s2;
	vector<int>list1(33, 0), list2(33, 0);

	cin >> s1 >> s2;

	for (i = 0; i < s1.length(); i++) {
		list1[(int)s1[i]-97]++;
	}


	for (i = 0; i < s2.length(); i++) {
		list2[(int)s2[i] - 97]++;
	}

	bool flag = false;

	for (i = 0; i < 33; i++) {
		if (list1[i] != list2[i]) {
			flag = true;
			break;
		}
	}

	if (flag == false) {
		cout << "YES" << endl;
	}
	else if (flag == true) {
		cout << "NO" << endl;
	}









	


	getchar();
	getchar();
	return 0;
}