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

signed main(){
  string S; cin >> S;
  vector< int > cnt( 256 );
  for( int i = 0; i < S.size(); ++i )
    ++cnt[ S[ i ] ];
  vector< int > fcnt;
  for( int i = 0; i < 256; ++i )
    if( cnt[ i ] > 1 )
      fcnt.emplace_back( cnt[ i ] );
  function< int ( int ) > fact = [ & ]( int x ){ return x == 0 ? 1 : x * fact( x - 1 ); };
  int ans = fact( ( int ) S.size() );
  for( int i = 0; i < fcnt.size(); ++i )
    ans /= fact( fcnt[ i ] );
  cout << ans - 1 << endl;
  return 0;
}