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#include <iostream>
#include <unordered_map>

struct pair_hash {
    template<class T1, class T2>
    std::size_t operator()(const std::pair<T1, T2> &p) const {
        auto h1 = std::hash<T1>{}(p.first);
        auto h2 = std::hash<T2>{}(p.second);
        return h1 ^ h2;
    }
};

uint64_t triangle(uint64_t n) {
    uint64_t count = 0;
    while (n) count += n--;
    return count;
}

uint64_t do_abc(const std::string &str) {
    size_t size = str.size();

    std::unordered_map<std::pair<int, int>, int, pair_hash> map;
    map[std::make_pair(0, 0)] = 1;

    for (int i = 0, a = 0, b = 0; i < size; i++) {
//        std::cout << i << std::endl;
        switch (str[i]) {
            case 'a':
                ++a;
                break;
            case 'b':
                ++b;
                break;
            case 'c':
                --a;
                --b;
                break;
        }
        auto key = std::make_pair(a, b);
        if (map.find(key) == map.end()) {
            map[key] = 1;
        } else {
            map[key]++;
        }
    }

    uint64_t count = 0;
    for (auto &p: map) {
//        std::cout << "Processing " << p.first.first << ", " << p.first.second << std::endl;
        int n = p.second;
        while (n--) count += n;
    }

    return count;
}

uint64_t do_two(const std::string &str, char c1, char c2) {
    size_t size = str.size();

    std::unordered_map<int, int> map;
    map[0] = 1;

    uint64_t count = 0;

    for (int i = 0, a = 0; i < size; i++) {
        if (str[i] == c1) {
            ++a;
        } else if (str[i] == c2) {
            --a;
        } else {
            for (auto &p: map) {
//                std :: cout << p.first << ": " << p.second << std::endl;
                uint64_t n = p.second;
                while (n--) count += n;
            }

            map.clear();
            map[0] = 1;
            a = 0;
            continue;
        }

        if (map.find(a) == map.end()) {
            map[a] = 1;
        } else {
            map[a]++;
        }
    }

    for (auto &p: map) {
//        std :: cout << p.first << ": " << p.second << std::endl;
        uint64_t n = p.second;
        while (n--) count += n;
    }

    return count;
}

uint64_t do_one(const std::string &str, char c) {
    size_t size = str.size();

    uint64_t count = 0;
    uint64_t streak = 0;

    for (uint64_t i = 0; i < size; i++) {
        if (str[i] == c) {
            ++streak;
//            std::cout << "I see a '" << str[i] << "', streak: " << streak << std::endl;
        } else {
//            std::cout << "I see a '" << str[i] << "', streak: " << streak << std::endl;
            count += triangle(streak);
            streak = 0;
//            std::cout << "Count: " << count << std::endl;
        }
    }

    return count + triangle(streak);
}

int main() {
    std::string line;
    std::getline(std::cin, line);

    uint64_t count = do_abc(line);
//    std::cout << "After including " << "abc" << ": " << count << std::endl;
    count += do_two(line, 'a', 'b');
//    std::cout << "After including " << "ab" << ": " << count << std::endl;
    count += do_two(line, 'b', 'c');
//    std::cout << "After including " << "bc" << ": " << count << std::endl;
    count += do_two(line, 'a', 'c');
//    std::cout << "After including " << "ac" << ": " << count << std::endl;
    count += do_one(line, 'a');
//    std::cout << "After including " << "a" << ": " << count << std::endl;
    count += do_one(line, 'b');
//    std::cout << "After including " << "b" << ": " << count << std::endl;
    count += do_one(line, 'c');
//    std::cout << "After including " << "c" << ": " << count << std::endl;

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