#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int i = 0; i < n; i++)

int comb(int n, int r) {
  if (r * 2 > n) r = n - r;
  int a = 1, b = 1;
  for (int i = 1; i <= r; i ++) {
    a *= (n - i + 1);
    b *= i;
  }
  return a / b;
}

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

    string s;
    cin >> s;

    int n = s.size();

    unordered_map<char, int> mp;
    REP(i, n) mp[s[i]]++;

    vector<int> A;
    for(auto x : mp) A.push_back(x.second);
    sort(A.begin(), A.end(), greater<int>());

    int ans = 1;
    REP(i, A.size()){
        ans *= comb(n, A[i]);
        n -= A[i];
    }
    cout << ans - 1 << endl; 

    return 0;
}