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#include <iostream>
#include <vector>
using namespace std;


int check(int a, int b)
{
    return a==b || a==0 || b==0;
}
int check(int a, int b, int c)
{
    if (a==0)
        return check(b,c);
    if (b==0)
        return check(a,c);
    if (c==0)
        return check(a,b);
    return a==b && b==c;
}
int main() {
    std::ios::sync_with_stdio(false);
    string s;
    cin >> s;
    size_t n = s.length();
    unsigned long long sum = 0;
    for (int i=0;i<n;i++)
    {
        int t[3];
        t[0] = t[1] = t[2] = 0;
        for (int j=i;j<n;j++)
        {
            t[s[j]-'a']++;
            sum += check(t[0], t[1], t[2]);
        }
    }
    cout << sum << endl;
}