#include <stdio.h>

int main(void) {
	// your code goes here
	char a[10], b[10];
	char c;
	int i, j, n, counta=0, countb=0;
	
	scanf("%s", a);
	scanf("%s", b);
	
	for(i=0;i<11;i++){
		if(a[i]==NULL){
			n=i;
			break;
		} 
	}
	
	for(i=0;i<n;i++){
		c=a[i];
		for(j=0;j<n;j++){
			if(a[j]==c) counta++;
		}
		for(j=0;j<n;j++){
			if(b[j]==c) countb++;
		}
		if(counta!=countb){
			printf("%s\n","NO");
			return 0;
		}
		counta=0;
		countb=0;
	}
	
	printf("%s\n","YES");
	

	return 0;
}