#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl

ll nCr(int n, int r)
{
  if (n == r || r == 0)
    return 1;
  else
    return nCr(n, r - 1) * (n - r + 1) / r;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    string s; cin >> s;
    sort(ALL(s));
    ll L = s.size();
    
    map<char, ll> mp;
    for(char c : s){
        mp[c]++;
    }

    vector<ll> A;
    for(auto pa : mp){
        A.push_back(pa.second);
    }

    ll ans = 1;
    for(ll a : A){
        ans *= nCr(L, a);
        L -= a;
    }

    p(ans-1);
    
    return 0;
}