#include "bits/stdc++.h"
using namespace std;


int main() {
	string S;
	cin >> S;

	map<char,int> m;
	int sumN=1;
	for (int i = 0; i < S.length(); i++) {
		m[S[i]]++;
		sumN *= i+1;
	}
	int sum = 1;
	for (auto itr = m.begin(); itr != m.end(); itr++) {
		int n = itr->second;
		for (int i = n; i > 0; i--) {
			sum *= i;
		}
	}

	cout << sumN/sum-1 << endl;
}