#include <stdio.h>

#define ALP ('z' - 'a' + 1)

int main(void)
{
	char a[11],b[11],an[ALP]={},bn[ALP]={},i;
	scanf("%s",a);
	scanf("%s",b);
	
	for (i=0;i<11;i++) {
		if (a[i]=='\0') break;
		an[a[i]-'a']++;
	}
	for (i=0;i<11;i++) {
		if (b[i]=='\0') break;
		bn[b[i]-'a']++;
	}
	for (i=0;i<ALP;i++) {
		if (an[i]!=bn[i]) {
			printf("NO\n");
			return 0;
		}
	}
	printf("YES\n");
	return 0;
}