#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(), (a).end()

int main() {
    cin.tie(nullptr);
    
    string S;
    cin >> S;
    ll siz = S.size();
    vector<int> cnt(26, 0);
    rep(i, 0, siz) cnt[S[i] - 'A']++;
    
    ll ans = 1;
    rep(i, 1, siz + 1) ans *= i;
    
    rep(i, 0, 26) rep(j, 1, cnt[i] + 1) ans /= j;
    
    cout << ans - 1 << '\n';
}