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#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

bool CzyZbalansowane(string podslowo, int dlugosc_podslowa) {
	bool a, b, c;
	a = b = c = false;
	int cnt_a, cnt_b, cnt_c;
	cnt_a = cnt_b = cnt_c = 0;
	for (int i = 0; i < dlugosc_podslowa; ++i)
	{
		if (podslowo[i] == 'a') 
		{
			a = true;
			++cnt_a;
		}
		else if(podslowo[i] == 'b')
		{
			b = true;
			++cnt_b;
		}
		else
		{
			c = true;
			++cnt_c;
		}
	}
	if (a && b && c)
	{
		if (cnt_a == cnt_b && cnt_b == cnt_c)
		{
			return true;
		}
		return false;
	}
	if (a && b)
	{
		if (cnt_a == cnt_b)
		{
			return true;
		}
		return false;
	}
	if (b && c)
	{
		if (cnt_b == cnt_c)
		{
			return true;
		}
		return false;
	}
	if (c && a)
	{
		if (cnt_c == cnt_a)
		{
			return true;
		}
		return false;
	}
	return true;
}

int main() {
	ios_base::sync_with_stdio(false), cin.tie(NULL);
	
	string slowo;
	cin >> slowo;
	int d = slowo.length();
	ll liczba_zbalansowanych_podslow = d;
	
	for (int i = 2; i <= d; ++i)
	{
		for (int j = 0; j <= d-i; ++j)
		{
			if (CzyZbalansowane(slowo.substr(j, i), i))
			{
				++liczba_zbalansowanych_podslow;
			}
		}
	}
	
	cout << liczba_zbalansowanych_podslow << '\n';

	return 0;
}