#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <algorithm>
using namespace std;

#define REP(i,n) for(int i=0; i<n; i++)
#define FOR(i,a,b) for(int i=a; i<=b; i++)
#define FORR(i,a,b) for (int i=a; i>=b; i--)

typedef long long ll;

int main(void){
	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;
}