#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define sz(n) (int)(n).size()
using namespace std;

int main() {
	string a, b;
	cin >> a >> b;
	sort(a.begin(), a.end());
	sort(b.begin(), b.end());
	if (a == b) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}