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#include <iostream>

using namespace std;

int main()
{
    string word;
    cin >> word;
    int a_count, b_count, c_count;
    int count = 0;
    for (int i = 0; i < word.length(); i++) {
        a_count = 0, b_count = 0, c_count = 0;
        for (int j = i; j < word.length(); j++) {
            if (word[j] == 'a') {
                a_count++;
            }
            if (word[j] == 'b') {
                b_count++;
            }
            if (word[j] == 'c') {
                c_count++;
            }
            if (a_count == 0 && b_count == 0) {
                count++;
                continue;
            }
            if (b_count == 0 && c_count == 0) {
                count++;
                continue;
            }
            if (a_count == 0 && c_count == 0) {
                count++;
                continue;
            }
            if (a_count == 0 && b_count == c_count) {
                count++;
                continue;
            }
            if (b_count == 0 && a_count == c_count) {
                count++;
                continue;
            }
            if (c_count == 0 && a_count == b_count) {
                count++;
                continue;
            }
            if (a_count == b_count && a_count == c_count) {
                count++;
                continue;
            }
        }
    }
    cout << count;
    return 0;
}