#include <stdio.h>

int main(void) {
	char S[8] = {0};
	char Map[26] = {0};
	int i, N = 0, dup = 0, res = 1;
	scanf("%s", S);
	for (i = 0; S[i] != 0; i++) {
		N++;
		Map[S[i]-65] += 1;
		
	}
	for (i = 2; i <= N; i++) {
		res *= i;
	}
	for (i = 0; i < N; i++) {
		if(Map[S[i]-65] >= 2) {
			res /= Map[S[i]-65];
			Map[S[i]-65] -= 1;
		}
	}
	printf("%d\n", res-1);
	return 0;
}