#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  string s;
  cin >> s;
  int az[26];
  for (int i = 0; i < 26; ++i) az[i] = 0;
  for (auto c : s) {
    az[c-'A']++;
  }
  ll ans = 1;
  for (int i = 2; i <= s.size(); ++i) ans *= i;
  for (int i = 0; i < 26; ++i) {
    if (az[i] > 1) {
      ll divaz = 1;
      for (int j = 2; j <= az[i]; ++j) divaz *= j;
      ans /= divaz;
    }
  }
  cout << ans-1 << endl;
  return 0;
}