#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main(){
	string S;
	cin >> S;
	int N = S.size();
	vector<int> fact(N + 1, 1);
	for (int i = 1; i <= N; i++){
		fact[i] = fact[i - 1] * i;
	}
	vector<int> cnt(26, 0);
	for (int i = 0; i < N; i++){
		cnt[S[i] - 'A']++;
	}
	int ans = fact[N];
	for (int i = 0; i < 26; i++){
		ans /= fact[cnt[i]];
	}
	cout << ans - 1 << endl;
}