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#include <bits/stdc++.h>
using namespace std;

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

    string s; cin >> s;

    int act[3] = {0};
    int wyn = 0;
    for(int i = 0; i < s.size(); i++)
    {
        act[0] = act[1] = act[2] = 0;
        for(int j = i; j < s.size(); j++)
        {
            act[s[j] - 'a']++;
            if(act[0] and act[1])
                if(act[0] != act[1])
                    continue;
            if(act[2] and act[1])
                if(act[2] != act[1])
                    continue;
            if(act[0] and act[2])
                if(act[0] != act[2])
                    continue;
            wyn++;
        }
    }
    cout << wyn << endl;
}