#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
using namespace std;

int main()
{
	int p[26] = {}, q[26] = {};
	string s, t;
	cin >> s >> t;
	for (int i = 0; i < static_cast<int>(s.size()); i++)
	{
		p[static_cast<int>(s[i] - 'a')]++;
	}
	for (int i = 0; i < static_cast<int>(t.size()); i++)
	{
		q[static_cast<int>(t[i] - 'a')]++;
	}
	for (int i = 0; i < 26; i++)
	{
		if (p[i] != q[i])
		{
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}