#include <iostream>
#include <fstream>
#include <string> 
#include <cmath>  
#include <cstdlib>
#include <ctime>
#include <vector>
#include <algorithm>
#include <numeric>
using namespace std;
int main() {
	int i;
	string A, B;
	cin >> A >> B;
	int a[26] = {};
	int b[26] = {};
	for (i = 0; i < A.size(); i++) {
		a[A[i] - 'a']++;
		b[B[i] - 'a']++;
	}
	for (i = 0; i < sizeof(a) / sizeof(a[0]); i++) {
		if (a[i] != b[i]) { 
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}