using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

public class Magatro
{
    static void Main()
    {
        List<int> C = new List<int>();
        string s = Console.ReadLine();
        string w = s;
        while (s.Length > 0)
        {
            string q = s.Replace(s[0].ToString(), "");
            C.Add(s.Length - q.Length);
            s = q;
        }
        int ans = kaizyou(w.Length);
        for(int i = 0; i < C.Count; i++)
        {
            ans /= kaizyou(C[i]);
        }
        Console.WriteLine(ans-1);
    }
    static int kaizyou(int n)
    {
        if (n == 0)
        {
            return 1;
        }
        return n * (kaizyou(n - 1));
    }
}