#include <stdio.h>
#include <string.h>


void sort(char s[])
{
	char temp;
	unsigned i, j;
	unsigned k = strlen(s) - 1;
	
	for (i = 0; i < strlen(s) - 1; i++) {
		for (j = 0; j < k; j++) {
			if ((unsigned)s[j] > (unsigned)s[j + 1]) {
				temp = s[j];
				s[j] = s[j + 1];
				s[j + 1] = temp;
			}
		}
		k--;
	}
}


int main(void)
{
	char a[11], b[11];

	scanf("%s", a);
	scanf("%s", b);

	sort(a);
	sort(b);

	if (strcmp(a, b))
		puts("NO");
	else
		puts("YES");

	return 0;
}