#include <bits/stdc++.h>
using namespace std;

int main() {
	string A, B;
	cin >> A >> B;
	map<char, int> Am, Bm;
	for(char c: A) Am[c] ++;
	for(char c: B) Bm[c] ++;
	if(Am == Bm) cout << "YES" << endl;
	else         cout << "NO" << endl;
	return 0;
}