#define _USE_MATH_DEFINES
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<climits>
#include<string>
#include<vector>
#include<list>
#include<map>
#include<set>
#include<cmath>
#include<queue>
#include<cstring>
#include<stack>
#include<functional>
using namespace std;

int fac(int n){
	int ans = n;
	while(--n>1) ans *= n;
	return ans;
}

int main(){
	string S;
	int cnt[26] = {};
	cin>>S;
	for(int i=0;i<S.size();i++){
		cnt[S[i]-'A']++;
	}
	int ans = fac(S.size());
	for(int i=0;i<26;i++){
		if(cnt[i]>1){
			ans /= fac(cnt[i]);
		}
	}
	printf("%d\n",ans-1);
	return 0;
}