using System;

namespace No170_1{
    public class Program{
        public static void Main(string[] args){
            var str = Console.ReadLine();
            var length = str.Length;
            var charCount = new int[26];
            var result = 1;

            foreach(var s in str)
                charCount[s - 'A']++;

            for(var i = 2; i <= length; i++)
                result *= i;

            foreach(var cc in charCount)
                for(var i = 2; i <= cc; i++)
                    result /= i;

            Console.WriteLine(--result);
        }
    }
}