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

int main()
{
	string A, B;
	cin >> A >> B;

	vector<int> a( 26 );
	vector<int> b( 26 );
	for( int i = 0; i < A.size(); i++ ) {
		a[ A[i] - 'a' ]++;
	}
	for( int i = 0; i < B.size(); i++ ) {
		b[ B[i] - 'a' ]++;
	}
	string ans = "NO";
	if( a == b ) ans = "YES";

	cout << ans << endl;
}