#include <algorithm>
#include <iostream>
#include <iomanip>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
using namespace std;

#define FOR(i,s,e) for (int i = int(s); i != int(e); i++)
#define FORIT(i,c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); i++)
#define ISEQ(c) (c).begin(), (c).end()

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;
}