#include <iostream>
#include <string>
#include <algorithm>
#include <cstdlib>
#include <string.h>

using namespace std;

int comp(const void *c1, const void *c2) {
	return *(char *)c1 - *(char *)c2;
}

int main() {
	char a[12], b[12];
	cin >> a >> b;

	qsort(a, strlen(a), sizeof(char), comp);
	qsort(b, strlen(b), sizeof(char), comp);

	if (strncmp(a,b,strlen(a)) == 0) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
	return 0;
}