#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) {
	char a[11], b[11];
	scanf("%s%s", a, b);

	sort(a, a + strlen(a));
	sort(b, b + strlen(b));

	for (int i = 0; i < strlen(a); i++) {
		if (a[i] != b[i]) {
			printf("NO\n");
			return 0;
		}
	}

	printf("YES\n");
	return 0;
}