#include <stdio.h>
#include <stdlib.h>

int compare(const void* a, const void* b){
	return *(int*)a - *(int*)b;
}
int main(void){
	char pri = 'a';
	char a[11], b[11];
	for(int i = 0; i < 11; i++){
		a[i] = 0;
		b[i] = 0;
	}
	scanf("%s", a);
	scanf("%s", b);
	qsort(a, 11, sizeof(char), compare);
	qsort(b, 11, sizeof(char), compare);
	int flag = 0;
	for(int i = 0; i < 11; i++){
		int c = a[i] - b[i];
		if(c < 0){
			c = -c;
		}
		flag += c;
	}
	if(flag == 0){
		printf("YES\n");
	}
	else printf("NO\n");
	return 0;
}