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

int main() {
  string S;
  cin >> S;
  set<pair<int, int>> SE;
  SE.insert({0, 0});
  for (int i = 0, f = 0, a = 0, b = 1, c = 2, x = 0, y = 0, t; i < S.size(); i++, f ^= 1) {
    if (S[i] == 'a') (f) ? SE.insert({x, ++y}) : SE.insert({x, --y});
    if (S[i] == 'b') SE.insert({--x, y}), t = a, a = c, c = b, b = t;
    if (S[i] == 'c') SE.insert({++x, y}), t = a, a = b, b = c, c = t;
  }
  cout << SE.size() << "\n";
}