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#include <iostream>
#include <string>

using namespace std;

bool balans(string text)
{
    int a=0, b=0, c=0;
    int l = (int) text.length();
    for(int i = 0; i < l; i++)
    {
        if(text[i] == 'a')
            a++;
        else if(text[i] == 'b')
            b++;
        else
            c++;
    }
    if(c == 0)
    {
        if((b == 0) || (a == 0))
            return true;
        else if(b == a)
            return true;
        else
            return false;
    }
    else if(b == 0)
    {
        if((c == 0) || (a == 0))
            return true;
        else if(c == a)
            return true;
        else
            return false;
    }
    else if(a == 0)
    {
        if((c == 0) || (b == 0))
            return true;
        else if(c == b)
            return true;
        else
            return false;
    }
    else
    {
        if((a==b)&&(a==c))
            return true;
    }
    return false;
}

int main()
{
    string slowo, podslowo;
    int a = 0, b = 0, c = 0;
    int odp;
    cin >> slowo;
    int ll = (int) slowo.length();
    odp = ll + (ll-1);
    if(odp > 3)
    {
        for(int j = 3; j <= ll; j++)
        {
            for(int i = 0; i <= ll-j; i++)
            {
                podslowo = slowo.substr(i, j);
                odp += balans(podslowo);
            }
        }
    }
    cout << odp;
    return 0;
}