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#include <iostream>
#include <set>
using namespace std;

bool checkIfBalanced(string str)
{
    int count[3] = { 0 };

    for (int i = 0; i < str.length(); i++)
    {
        count[str[i]-97]++;
    }

    set<int> checker;
    checker.insert(count, count + 3);
    checker.erase(0);

    return checker.size() == 1;
}

int main()
{
    int balancedCount = 0;
    string zdanie;
    cin >> zdanie;
    for (int i = 1; i < zdanie.length(); i++)
    {
        for (int j = 0; j <= zdanie.length() - i; j++)
        {
            balancedCount += checkIfBalanced(zdanie.substr(j, i));
        }
    }
    cout << balancedCount;
    return 0;
}