#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main()
{
    string str;
    cin >> str;
    long long len = str.size();
    long long  left, right;
    long long sum = 0;
    char s;
    for (long long i = 0; i < len; i++)
    {
        s = str[i];
        for (right = i + 1; right < len; right++)//向右寻找相同的
            if (str[right] == s)
                break;

        for (left = i - 1; left >= 0; left--)//向左寻找相同的
            if (str[left] == s)
                break;
        sum += (right - i) * (i - left);//累加贡献度
    }
    cout << sum << endl;
    return 0;
}