#include<stdio.h>
#include<string.h>
int main()
{
	char a[20], b[20];
	scanf("%s%s", a, b);
	int i, n = strlen(a);
	int count[2][30];
	for (i = 0; i < 30; i++)
		count[0][i] = count[1][i] = 0;
	for (i = 0; i < n; i++)
		count[0][a[i] - 'a']++;
	for (i = 0; i < n; i++)
		count[1][b[i] - 'a']++;
	for (i = 0; i < 30; i++)
	{
		if (count[0][i] != count[1][i])
		{
			printf("NO\n");
			return 0;
		}
	}
	printf("YES\n");
	return 0;
}