using System;
using System.Collections.Generic;

namespace _170
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            Dictionary<char,int> dic = new Dictionary<char,int>();
            for (int i = 0; i < s.Length; i++)
            {
                if (!dic.ContainsKey(s[i])) dic[s[i]] = 0;
                dic[s[i]]++;
            }
            long ret = 1;
            for (int i = 1; i <= s.Length; i++) ret *= i;
            foreach (var item in dic)
            {
                int a = 1;
                for (int i = 1; i <= item.Value; i++) a *= i;
                ret /= a;
            }
            Console.WriteLine(ret - 1);
        }
    }
}