#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <numeric>

#define N 26

using namespace std;
typedef long long int lint;

int main()
{
	int Achar[N] = { 0 }, Bchar[N] = { 0 };
	string A, B;
	cin >> A >> B;

	for (int i = 0; i < A.size(); i++) {
		Achar[A[i] - 'a']++;
		Bchar[B[i] - 'a']++;
	}

	for (int i = 0; i < N; i++) {
		if (Achar[i] != Bchar[i]) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;

	return 0;
}