using System;

class Program
{
    static void Main()
    {
        string s = Console.ReadLine();

        var cnt = new int[26];

        for (int i = 0; i < s.Length; i++)
        {
            cnt[s[i] - 65]++;
        }

        int ans = 1;
        int len = s.Length;

        for(int i = 0; i < 26; i++)
        {
            if (cnt[i] == 0) continue;
            int a = 1, b = 1;
            for (int j = 0; j < cnt[i]; j++)
            {
                a *= len - j;
                b *= j + 1;
            }
            ans = ans * a / b;
            len -= cnt[i];
        }
        ans--;

        Console.WriteLine(ans);
    }
}