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#include <iostream>
#include <vector>

using namespace std;

string wytnij(string text, int start, int end)
{
    string t = "";
    for (int i = start; i <= end; i++)
    {
        t += text[i];
    }
    return t;
}

bool czyBalanced(string text)
{
    if (text == "")
        return false;
    int a = 0;
    int b = 0;
    int c = 0;
    for (char litera : text)
    {
        switch (litera)
        {
        default:
            break;
        case 'a':
            a++;
            break;
        case 'b':
            b++;
            break;
        case 'c':
            c++;
            break;
        }
    }
    if (b == 0 && c == 0)
    {
        return true;
    }
    else if (a == 0 && c == 0)
    {
        return true;
    }
    else if (a == 0 && b == 0)
    {
        return true;
    }
    else if (a == 0)
    {
        return b == c;
    }
    else if (b == 0)
    {
        return a == c;
    }
    else if (c == 0)
    {
        return a == b;
    }
    else
    {
        return a == b && b == c;
    }
}

bool czyJest(vector <string>* array, string value)
{
    for (string temp : *array)
    {
        if (temp == value)
            return true;
    }
    return false;
}

int main()
{
    string text = "";
    vector <string> balanced = {};
    int wynik = 0;
    int start = 0;
    cin >> text;
    int rozmiar = text.length();
    for (int i = 0; i < rozmiar; i++)
    {
        for (int j = 0; j < rozmiar; j++)
        {
            if (czyBalanced(wytnij(text, i, j)))
            {
                if (!czyJest(&balanced, wytnij(text, i, j)))
                {
                    if (wytnij(text, i, j) != "")
                    {
                        wynik++;
                    }
                }
            }
        }
    }
    cout << wynik;
}