#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main(void) {
	string A, B;
	cin >> A >> B;
	sort(A.begin(), A.end());
	sort(B.begin(), B.end());
	
	if(A == B) printf("YES\n");
	else printf("NO\n");
	return 0;
}