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

string s;

int main() {
    ios_base::sync_with_stdio(0);
    cin >> s;
    int output = 0;
    for(int i=0; i<s.length(); i++) {
        int a=0,b=0,c=0;
        for(int j=i; j<s.length(); j++) {
            switch(s[j]) {
                case 'a': a++; break;
                case 'b': b++; break;
                case 'c': c++; break;
            }
            if(a == 0) {
                if(b == 0) {
                    if(c == 0) cerr << "impossible" << endl;
                    else output++;
                } else {
                    if(c == 0) output++;
                    else if(b == c) output++;
                }
            } else {
                if(b == 0) {
                    if(c == 0) output++;
                    else if(a == c) output++;
                } else {
                    if(c == 0) { if(a == b) output++; }
                    else if(a == b && b == c) output++;
                }
            }
        }
    }
    cout << output << endl;
}