using System.Collections.Generic;
using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var sL = s.Length;
        if (sL == 1) { Console.WriteLine(0); goto end; }
        if (sL == 2)
            if (s[0] == s[1]) { Console.WriteLine(0); goto end; }
            else { Console.WriteLine(1); goto end; }
        Console.WriteLine(getAns(s));
        end:;
    }
    public static int getAns(string s)
    {
        var d = new Dictionary<char, int>();
        foreach (var x in s)
            if (d.ContainsKey(x)) d[x]++;
            else d[x] = 1;
        var ans = getFact(s.Length);
        foreach (var x in d)
            if (x.Value >= 2) ans /= getFact(x.Value);
        return ans - 1;
    }
    public static int getFact(int n)
    {
        if (n == 1) return 1;
        if (n == 2) return 2;
        if (n == 3) return 6;
        var ans = 6;
        for (int i = 4; i <= n; i++) ans *= i;
        return ans;
    }
}