#include <stdio.h>

int main(void) {
	char A[11], B[11];
	int i, j, num_a[26] = {0}, num_b[26] = {0};
	scanf("%s", A);
	scanf("%s", B);
	i = 0;
	while(A[i] != '\0'){
		num_a[A[i] - 97]++;
		num_b[B[i] - 97]++;
		i++;
	}
	for(j = 0;j < 26;j++){
		if(num_a[j] != num_b[j]){
			printf("NO\n");
			return 0;
		}
	}
	printf("YES");
	
	return 0;
}