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//Wojciech Filipek
#include "bits/stdc++.h"
using namespace std;

int policz(string sl, int znak){
    char litera;
    int ile = 0;

    if(znak == 1)
        litera = 'a';
    else if(znak == 2)
        litera = 'b';
    else
        litera = 'c';

    for(int i = 0; i < sl.length(); i++){
        if(sl[i] == litera)
            ile++;
    }
    return ile;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    string slowo;
    cin >> slowo;
    int a, b, c = 0;
    string test;
    int wynik = 0;

    for(int i = 0; i < slowo.length(); i++){
        for(int k = slowo.length(); k > i; k--){
            test = slowo.substr(i,k-i);

            int a = policz(test, 1);
            int b = policz(test, 2);
            int c = policz(test, 3);

            if(a == b && b == c || b == 0 && c == 0 || a == 0 && b == 0 || a == 0 && c == 0 || 
                a == b && c == 0 || a == c && b == 0 || b == c && a == 0)
                wynik++;
        }
    }
    cout << wynik << endl;
}