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#include <iostream>
#include <map>
#include <tuple>
#include <string>
using namespace std;
typedef long long ll;

pair<int, int> abcpos;
// logical value is phys - abcpos
map<pair<int, int>, int> abc;

struct shiftmap {
    int shift = 0;
    map<int, int> xy;

    void x() {
        xy[shift]++;
        shift--;
    }

    void y() {
        xy[shift]++;
        shift++;
    }

    void z() {
        xy.clear();
        shift = 0;
    }

    int get() {
        return xy[shift];
    }
};

shiftmap ab, ac, bc;
string s;
ll total;

int main() {
    ios::sync_with_stdio(false); cin.tie();
    cin >> s;

    int run = 0;
    char runchar = 0;
    for (char c : s) {
        if (runchar == c) run++;
        else run = 1, runchar = c;
        total += run;

        abc[abcpos]++;
        switch (c) {
            case 'a': abcpos.first++; abcpos.second++; ab.x(); ac.x(); bc.z(); break;
            case 'b': abcpos.first--; ab.y(); ac.z(); bc.x(); break;
            case 'c': abcpos.second--; ab.z(); ac.y(); bc.y(); break;
        }

        total += abc[abcpos];
        total += ab.get();
        total += ac.get();
        total += bc.get();
    }

    cout << total << '\n';
}