#include<iostream>
#include<algorithm>
using namespace std;
using lint=int64_t;

int main()
{
	string S[2];

	for(int i=0;i<2;i++)
	{
		cin >> S[i];
		sort(S[i].begin(),S[i].end());
	}

	if(S[0]==S[1])
		cout << "YES";
	else 
		cout << "NO";
	cout << endl;
	return 0;
}