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

int F(int a){
  return a?a*F(a-1):1;
}

signed main(){
  string s;cin>>s;
  map<char,int> m;
  for(char p:s)m[p]++;
  int ans=F(s.size());
  for(auto p:m)ans/=F(p.second);
  cout<<ans-1<<endl;
}