using System;
using System.Collections.Generic;
using System.Linq;

namespace yukicoder
{
	public class Program
	{
		public static void Main()
		{
			var s = Console.ReadLine();
            var d = new Dictionary<char, int>();
            var l = new List<char>();
			foreach(var c in s)
            {
                if (d.ContainsKey(c))
                {
                    d[c]++;
                }
                else
                {
                    d.Add(c, 1);
                    l.Add(c);
                }
            }
            var k = 1;
            foreach(var c in l)
            {
                k *= Factorial(d[c]);
            }
            Console.WriteLine(Factorial(s.Length) / k - 1);
        }
        static int Factorial(int n) =>
        n == 0 ? 1 : n * Factorial(n - 1);
    }
}