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#include <iostream>

using namespace std;

// true if nonzero arugments are equal
bool is_balanced(int a, int b, int c) {
    if (a == b && b == c) {
        return true;
    }
    if (a == 0 && b == c) {
        return true;
    }
    if (a == c && b == 0) {
        return true;
    }
    if (a == b && c == 0) {
        return true;
    }
    if (a == 0 && b == 0 && c != 0) {
        return true;
    }
    if (a == 0 && b != 0 && c == 0) {
        return true;
    }
    if (a != 0 && b == 0 && c == 0) {
        return true;
    }
    return false;
}

int main() {
    string s;
    cin >> s;
    int count = 0;
    int count_a = 0;
    int count_b = 0;
    int count_c = 0;

    for(int i = 0; i < s.length(); i++) {
        for(int j = i; j < s.length(); j++) {
            if(s[j] == 'a') {
                count_a++;
            }
            if(s[j] == 'b') {
                count_b++;
            }
            if(s[j] == 'c') {
                count_c++;
            }
            if (is_balanced(count_a, count_b, count_c)) {
                count++;
            }

        }
    count_a = 0;
    count_b = 0;
    count_c = 0;
    }

    cout << count << endl;
    return 0;
}