#include<iostream>
#include<string>
#define REP(i,n) for(int i=0;i<n;i++)
#define FACTORIAL(j,n) int ans=1;for(int j=0;j<n;j++){ans*=(n-j);}
using namespace std;

int main() {
	string s;
	int denom, numer = 1, count[26] = {};
	cin >> s;
	FACTORIAL(j, s.length())
		denom = ans;
	REP(i, s.length())
		count[s[i] - 'A']++;
	REP(i, 26) {
		if (count[i]) {
			FACTORIAL(j, count[i])
				numer *= ans;
		}
	}
	cout << denom / numer - 1;
}