#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <climits>
#include <vector>
#include <numeric>
#include <complex>
#include <map>
#include <bitset>
using namespace std;

//#define __int64 long long
#define long __int64
#define REP(i,a,b) for(int i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
const int Vecy[4] = {0,-1,0,1};
const int Vecx[4] = {1,0,-1,0};

int func(int a){
	int ans = 1;
	for(int i=1; i<=a; i++){
		ans *= i;
	}
	return ans;
}

int main(){
	string s;
	int cnt[26] = {0};
	int ans;
	
	cin >> s;
	
	rep(i,s.length()){
		cnt[ s[i] - 'A'] ++;
	}
	
	ans = func(s.length());
	rep(i, 26){
		if(cnt[i] >= 2){
			ans /= func(cnt[i]);
		}
	}
	
	cout << ans - 1<< endl;
    
    return 0;
}