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#include<iostream>
#include<vector>
#include<string>
using namespace std;

long long check(long long a, long long b, long long c) {
    if (a == b && b == c) return 1;
    if (a == b && c == 0) return 1;
    if (a == c && b == 0) return 1;
    if (b == c && a == 0) return 1;
    if (a == 0 && b == 0) return 1;
    if (b == 0 && c == 0) return 1;
    if (a == 0 && c == 0) return 1;
    return 0;
}

long long sub(vector<long long>& v, int a, int b) {
    long long res = v[b];
    if (a > 0) {
        res -= v[a - 1];
    }
    return res;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    string str;
    cin >> str;
    int n = str.length();
    vector<long long> va(n);
    vector<long long> vb(n);
    vector<long long> vc(n);
    for (int i = 0; i < n; i++) {
        if (i > 0) {
            va[i] = va[i - 1];
            vb[i] = vb[i - 1];
            vc[i] = vc[i - 1];
        }
        if (str[i] == 'a') { va[i]++; }
        if (str[i] == 'b') { vb[i]++; }
        if (str[i] == 'c') { vc[i]++; }
    }

    long long res = 0;
    for (int i = 0; i < n; i++) {
        for (int j = i; j < n; j++) {
            long long a = sub(va, i, j);
            long long b = sub(vb, i, j);
            long long c = sub(vc, i, j);
            res += check(a, b, c);
        }
    }
    cout << res;

    return 0;
}