#include <bits/stdc++.h>

using namespace std;

namespace {

    typedef double real;
    typedef long long ll;

    template<class T> ostream& operator<<(ostream& os, const vector<T>& vs) {
        if (vs.empty()) return os << "[]";
        os << "[" << vs[0];
        for (int i = 1; i < vs.size(); i++) os << " " << vs[i];
        return os << "]";
    }
    template<class T> istream& operator>>(istream& is, vector<T>& vs) {
        for (auto it = vs.begin(); it != vs.end(); it++) is >> *it;
        return is;
    }

    string s;
    void input() {
        cin >> s;
    }

    int fact(int n) {
        int r = 1;
        for (int i = 1; i <= n; i++) {
            r *= i;
        }
        return r;
    }

    int comb(int n, int k) {
        return fact(n) / fact(k) / fact(n - k);
    }

    void solve() {
        map<char, int> M;
        for (int i = 0; i < s.size(); i++) {
            M[ s[i] ]++;
        }
        int ans = 1;
        int n = s.size();
        for (auto it = M.begin(); ; it++) {
            if (++it == M.end()) break;
            --it;
            int k = it->second;
            ans *= comb(n, k);
            n -= k;
        }
        cout << ans - 1 << endl;
    }
}

int main() {
    input(); solve();
    return 0;
}