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

int main(void){
	int l,i,al[128]={0},bl[128]={0},na,nb;
	char a[16],b[16];
	scanf("%s%s",a,b);
	l = strlen(a);
	for(i = 0;i < l;i++){
		na = a[i];nb = b[i];
		al[na]++;bl[nb]++;
	}
	for(i = 97;i <= 122;i++){
		if(al[i] != bl[i]){printf("NO\n");return 0;}
	}
	printf("YES\n");
	return 0;
}