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#include <cstdio>
#include <cstdlib>
#include <cstdint>

#include <tuple>
#include <map>

static const size_t MAX_N = 300 * 1000;

char word[MAX_N + 1];

long long int count_singular(size_t N) {
    long long int ret = 0;
    char prev = 'x';
    size_t last_pos = 0;
    for (size_t i = 0; i < N; i++) {
        if (prev != word[i]) {
            prev = word[i];
            last_pos = i;
        }
        ret += i + 1 - last_pos;
    }
    return ret;
}

long long int count_double(size_t N, char c1, char c2) {
    long long int ret = 0;

    std::map<int64_t, long long int> tracker;
    tracker[0] = 1;
    int64_t bias = 0;

    for (size_t i = 0; i < N; i++) {
        if (word[i] == c1) {
            ++bias;
        } else if (word[i] == c2) {
            --bias;
        } else {
            tracker.clear();
            tracker[0] = 1;
            bias = 0;
            continue;
        }
        ret += tracker[bias]++;
    }

    return ret;
}

long long int count_triple(size_t N) {
    long long int ret = 0;

    std::map<int64_t, long long int> tracker;
    int64_t bias = 0;
    tracker[bias] = 1;

    for (size_t i = 0; i < N; i++) {
        if (word[i] == 'a') {
            bias -= 1 << 20;
            bias -= 1;
        } else if (word[i] == 'b') {
            bias += 2 << 20;
            bias -= 1;
        } else {
            bias -= 1 << 20;
            bias += 2;
        }
        ret += tracker[bias]++;
    }

    return ret;
}

int main() {
    size_t N = 0;
    if (!fgets(word, MAX_N+1, stdin)) {
        return 1;
    }

    while (true) {
        if (word[N] != 'a' && word[N] != 'b' && word[N] != 'c') {
            break;
        }
        N++;
    }

    long long int ret = 0;

    ret += count_singular(N);
    ret += count_double(N, 'a', 'b');
    ret += count_double(N, 'a', 'c');
    ret += count_double(N, 'b', 'c');
    ret += count_triple(N);

    printf("%lld\n", ret);

    return 0;
}