using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void getAns(string s)
    {
        var n = s.Length;
        var a = new long[26, n];
        for (int i = 0; i < 26; i++)
        {
            if (s[0] - 'A' == i) a[i, 0] = 1;
            for (int j = 1; j < n; j++)
            {
                a[i, j] = a[i, j - 1];
                if (s[j] - 'A' == i) a[i, j]++;
            }
        }
        var ans = 0L;
        for (int i = 1; i < n - 1; i++)
        {
            var t = s[i] - 'A';
            if (a[t, i - 1] < 1) continue;
            var ww = n - 1 - i - (a[t, n - 1] - a[t, i]);
            ans += ww * (a[t, i - 1]);
        }
        Console.WriteLine(ans);
    }
}