#pragma GCC optimize ("O3")

#include <iostream>
#include <cstring>

using namespace std;


bool valid(int counter[3]) {
    int last = counter[0];
    for (int i = 1; i < 3; i++) {
        if (counter[i] == 0)
            continue;
        if (last == 0) {
            last = counter[i];
        } else if (counter[i] != last) {
            return false;
        }
    }
    return true;
}


int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    string text;
    cin >> text;
    int n = text.length();
    int counter[3];
    int sum = n * 2 - 1;
    for (int i = 0; i < n - 2; i++) {
        memset(counter, 0, sizeof(counter));
        for (int r = i; r < i + 3; r++) {
            counter[text[r] - 97]++;
        }
        for (int j = 3; j < n - i + 1; j++) {
            if (valid(counter)) {
                sum++;
            }
            counter[text[j + i] - 97]++;
        }
    }
    cout << sum;
    return 0;
}