#include <stdio.h>

int f(int n) {
	if (n <= 1) return 1;
	else return n * f(n - 1);
}

int main() {
	int s, c['z' + 1] = {}, cnt = 0;
	while ((s = getchar()) != '\n') { c[s]++; cnt++; }
	
	int t = 1, i;
	for (i = 'A'; i <= 'Z'; i++) t *= f(c[i]);
	int ans = f(cnt) / t - 1;

	printf("%d\n", ans);
	return 0;
}