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

template <typename T, typename U> bool cmin(T &a, U b) { return a > b && (a = b, true); }
template <typename T, typename U> bool cmax(T &a, U b) { return a < b && (a = b, true); }

signed main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);

  string S;
  cin >> S;
  int N = S.size();
  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; i < N; i++) {
    int now = S.at(i) - 'a';
    if (f) {
      if (now == a) {
        SE.insert({x, --y});
      } else if (now == b) {
        SE.insert({--x, y});
        int tmp = a;
        a = c;
        c = b;
        b = tmp;
      } else {
        SE.insert({++x, y});
        int tmp = a;
        a = b;
        b = c;
        c = tmp;
      }
      f = 0;
    } else {
      if (now == a) {
        SE.insert({x, ++y});
      } else if (now == b) {
        SE.insert({--x, y});
        int tmp = a;
        a = c;
        c = b;
        b = tmp;
      } else {
        SE.insert({++x, y});
        int tmp = a;
        a = b;
        b = c;
        c = tmp;
      }
      f = 1;
    }
  }
  cout << SE.size() << "\n";
}