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#include <stdio.h>
#include <time.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <map> 
#include <string>
#include <vector>  
#include <iostream> 
#include <sstream> 
#include <queue>
#include <algorithm>
#include <assert.h>


using namespace std;

#define ll long long
#define PB 		push_back
#define FOR(a,start,end) 	for(int a=int(start); a<int(end); a++)
#define INF 		INT_MAX
#define SORT(a) 	sort(a.begin(),a.end()) 
#define CL(a,x) 		memset(a,x,sizeof(a))
#define REP(a,x)	for(int a=0;a<x;a++)
#define REP1(a,x)	for(int a=1;a<=x;a++)
#define MP 		make_pair



typedef vector<ll>     vi;
typedef pair<ll, ll>     pii;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vector<ll> > vvi;
typedef vector<vector<string> > vvs;
typedef vector<pair<string, string> > vss;
typedef pair<string, string> pss;
typedef pair<ll, pii> ppii;
typedef vector<ppii> vppii;
typedef vector<vector<pii> > vvii;
typedef vector<vvi> vvvi;


ll n, k, a, b, c, z, m, d, p;
ll tb[300001][3];
ll ta[300001][8];
ll tc[300001][8];
vi vk, va, vb;
string w;

pii por(int a, int b) {
	pii p0 = MP(0, 0);
	ll td[3];
	CL(td, 0);
	for (int j = 0; j < 3; j++) {
		td[j] = tb[b][j] - tb[a][j];
	}
	for (int j = 0; j < 3; j++) {
		if (td[j] > 0)
			p0.first |= (1 << j);
	}
	if (p0.first == 7)
		p0.second = max(abs(td[1] - td[0]), max(abs(td[2] - td[1]), abs(td[0] - td[2])));
	else if (p0.first == 3)
		p0.second = abs(td[1] - td[0]);
	else if (p0.first == 5)
		p0.second = abs(td[2] - td[0]);
	else if (p0.first == 6)
		p0.second = abs(td[2] - td[1]);
	else
		p0.second = max(td[0], max(td[1], td[2]));
	return p0;
}
ll maxpor(int a, int b) {
	ll c = 0;
	for (int j = 0; j < 3; j++)
		c = max(c, tb[b][j] - tb[a][j]);
	return c;

}
int main() {
	//freopen("c:\\wojtek\\uva\\pa\\debug\\t1.in", "rt", stdin);
//	while (1) {
		cin >> w;
		CL(ta, 0);
		CL(tb, 0);
		CL(tc, -1);
		n = w.size();
		z = 0;
		for (int i = 1; i <= n; i++) {
			for (int j = 0; j < 3; j++) {
				if (j == (w[i - 1] - 'a'))
					tb[i][j] = tb[i - 1][j] + 1;
				else
					tb[i][j] = tb[i - 1][j];
			}
		}
		
		for (int i = 1; i <= n; i++) {
			int a = i - 1;
			
			ta[i][1 << (w[i - 1] - 'a')] = ta[i-1][1 << (w[i - 1] - 'a')] + 1;
			z += ta[i][1 << (w[i - 1] - 'a')];
			c = ta[i][1 << (w[i - 1] - 'a')];
			if (i - 2 * c >= 0) {
				d = 1;
				for (int a = i - 2 * c; a >= 0; a -= 2) {
					pii p1 = por(a, i);
					if (p1.first < 7) {
						if (p1.second == 0) {
							ta[i][p1.first] = ta[a][p1.first] + 1;
							z += ta[i][p1.first];
							if (tc[a][p1.first] == -1)
								//tc[i] = i-(2 * ta[i][p1.first]);
								tc[i][p1.first] = a;
							else
								tc[i][p1.first] = tc[a][p1.first];
							d = i-(tc[i][p1.first] + (i - tc[i][p1.first]) % 3);
							d /= 3;
							//d = maxpor(a, i);
							break;
						}
					}
					else {
						a += (i - a) % 3;
						//	a = 3 * ((i - a) / 2 - 1);
						//	d = maxpor(i - a, i);
						d = maxpor(a, i);
						break;
					}
				}
				c = (3 * d);
				//	c = 3;
				for (int a = i - c; a >= 0; a -= 3) {
					pii p1 = por(a, i);
					if (p1.first == 7) {
						if (p1.second == 0) {
							ta[i][p1.first] = ta[a][p1.first] + 1;
							z += ta[i][p1.first];
							break;
						}
						d = maxpor(a, i);
						c = 3 * d;
						a = i - c + 3;
					}
					else
						//break;
						continue;
				}
			}
		}
		/*
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j < 8; j++)
				z += ta[i][j];
		}
		*/
		cout << z << endl;
//	}
	return 0;

}