#include <iostream>
#include <string>
#include <vector>
#include <map>

using namespace std;

#define INF 		2000000007
#define MOD			1000003

#define MAX 		105

#define REP(i,n)	for(int i=0;i<(n);++i)
#define REPS(i,s,t)	for(int i=(s);i<(t);++i)

typedef unsigned int 			uint;
typedef unsigned long long int	ull;

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

	vector<int> p(10,1);
	REPS(i,2,str.size()+1){
		p[i] = p[i-1]*i;
	}

	map<char,int> st;
	for(char t:str){
		if(st[t]) st[t]++;
		else st[t] = 1;
	}
	int ans = p[str.size()];
	for(auto t:st){
		if(t.second > 1)
			ans /= p[t.second];
	}
	ans--;
	cout << ans << endl;
	return 0;
}