#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int INF = 1e9;
const int MOD = 1e9+7;

int combi(int n,int r){
	int a=1,b=1;
	if(n == 0 || r==0)return 1;
	for(int i=1;i<=r;i++){
		a *= i;
	}
	for(int i=0;i<r;i++){
		b *= n-i;
	}
	return b/a;
}

int main(void) {
	string s;
	cin >> s;
	int n = s.size();
	vector<int> cnt(26);
	for(int i=0;i<s.size();i++){
		cnt[s[i]-'A']++;
	}
	ll ret = 1;
	for(int i=0;i<26;i++){
		int t = combi(n,cnt[i]);
		//cout << n << " " << cnt[i] << " " << t << endl;
		ret *= t;
		n -= cnt[i];
	}
	cout << ret-1 << endl;

	return 0;
}