#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;


int main() {
  string s; cin >> s;
  int x = 0, y = 0;
  vector<char> tri{'a', 'b', 'c'};
  set<pair<int, int>> area{{x, y}};
  for (char c : s) {
    if ((x + y) % 2 == 0) {
      if (tri[0] == c) {
        ++x;
        tri = {tri[2], tri[1], tri[0]};
      } else if (tri[1] == c) {
        --y;
        tri = {tri[1], tri[0], tri[2]};
      } else {
        --x;
        tri = {tri[0], tri[2], tri[1]};
      }
    } else {
      if (tri[0] == c) {
        ++y;
        tri = {tri[1], tri[0], tri[2]};
      } else if (tri[1] == c) {
        ++x;
        tri = {tri[0], tri[2], tri[1]};
      } else {
        --x;
        tri = {tri[2], tri[1], tri[0]};
      }
    }
    area.emplace(x, y);
  }
  cout << area.size() << '\n';
  return 0;
}