#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <iomanip>
#include <iostream>
#include <map>
#include <memory>
#include <numeric>
#include <set>
#include <stack>
#include <string>
#include <vector>

#define rep(i, a, b) for (int i = (a); i < (b); ++i)
#define MOD 1000000007
#define int long long
using ll = long long;
using namespace std;
const int INF = 1LL << 50;
using P       = pair<int, int>;

template <class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    } else {
        return false;
    }
}
template <class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    } else {
        return false;
    }
}

struct Setup {
    Setup() {
        cin.tie(0);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(20);
    }
} SETUP;

template <typename T>
T nCr(T n, T r) {
    T a = 1;
    for (T d = 1; d <= r; ++d) {
        a *= n--;
        a /= d;
    }
    return a;
}

signed main() {
    string s;
    cin >> s;
    map<char, int> mp;
    for (auto c : s) {
        mp[c]++;
    }
    int ans = 1;
    int len = s.size();
    for (auto p : mp) {
        ans *= nCr(len, p.second);
        len -= p.second;
    }

    cout << ans - 1 << endl;
}