#include <iostream>
#include <string>
#include <vector>
using namespace std;

int fact(int n)
{
	int result = 1;
	for (int i = 2; i <= n; i++) {
		result *= i;
	}
	return result;
}

int main(int argc, char **argv)
{
	string S;
	cin >> S;
	
	vector<int> V(26);
	for (char ch : S) V[ch - 'A']++;

	int result = fact(S.length());
	for (int n : V) result /= fact(n);
	result--;
	cout << result << endl;
}