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#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pii pair<int, int>

const int MAXN = 3e5;

string s;

ll calcOne(char c) {
    ll tmp = 0, res=0;

    for (auto u : s) {
        if (u == c) {
            ++tmp;
        } else {
            res += (tmp*(tmp+1ll))/2ll;
            tmp = 0;
        }
    }

    res += (tmp*(tmp+1ll))/2ll;
    return res;
}

ll calcTwo(char a, char b) {
    map<int, int> t;

    ll res = 0;
    int tmp = 0;
    ++t[0];

    int i = 0;
    for (auto u : s) {
        if (u == a) ++tmp;
        else if (u == b) --tmp;
        else {
            t.clear();
            ++t[0];
            tmp = 0;
            continue;
        }

        res += t[tmp];
        ++t[tmp];
        ++i;
    }

    return res;
}

ll calcThree() {
    map<pii, int> t;
    ll res = 0;

    pii tmp = {0, 0};
    ++t[tmp];
    
    for (auto u : s) {
        if (u == 'a') ++tmp.first;
        else if (u == 'b') {
            --tmp.first;
            ++tmp.second;
        } else --tmp.second;

        res += t[tmp];
        ++t[tmp];
    }

    return res;
}

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

    cin>>s;

    ll ans = calcOne('a')+calcOne('b')+calcOne('c');
    ans += calcTwo('a', 'b')+calcTwo('a', 'c')+calcTwo('b', 'c');
    ans += calcThree();

    cout<<ans<<endl;
}