#include <stdio.h>

int main(void)
{
	int i;
	char str_a[10];
	char str_b[10];
	int word_a[26] = {0};
	int word_b[26] = {0};


	scanf("%s", str_a);
	scanf("%s", str_b);

	for ( i = 0; str_a[i] != '\0'; i++ ) {
		if ('a' <= str_a[i] && str_a[i] <= 'z') {
			word_a[str_a[i] - 'a']++;
		}
	}

	for ( i = 0; str_b[i] != '\0'; i++ ) {
		if ('a' <= str_b[i] && str_b[i] <= 'z') {
			word_b[str_b[i] - 'a']++;
		}
	}

	for ( i = 0; i < 10; i++ ) {
		if ( word_a[i] != word_b[i] ) {
			puts("NO");
			return 0;
		}	
	}
	puts("YES");
	return 0;
}