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

int main() {
	string S;
	int C[26] = {}, N;
	long long ANS = 1;
	cin >> S;
	N = S.size();
	for (int i = 0; i < S.size(); i++) {
		C[S[i] - 'A']++;
	}
	for (int i = 0; i < 26; i++) {
		if (C[i] != 0) {
			for (int j = N; j > C[i]; j--) ANS *= j;
			for (int j = 1; j <= N - C[i]; j++) ANS /= j;
			N -= C[i];
		}
	}
	cout << ANS - 1 << endl;
}