#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using P = pair<int, int>;
using PL = pair<lint, lint>;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define ALL(a)  (a).begin(),(a).end()
constexpr int MOD = 1000000007;
constexpr lint B1 = 1532834020;
constexpr lint M1 = 2147482409;
constexpr lint B2 = 1388622299;
constexpr lint M2 = 2147478017;
constexpr int INF = 2147483647;
void yes(bool expr) {cout << (expr ? "Yes" : "No") << "\n";}
template<class T>void chmax(T &a, const T &b) { if (a<b) a=b; }
template<class T>void chmin(T &a, const T &b) { if (b<a) a=b; }
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  string S;
  cin >> S;
  set<tuple<int,int,int>> st;
  st.insert(make_tuple(0,0,0));
  int x = 0, y = 0, z = 0, m = 0;
  REP(i, S.size()) {
    if(i%2 == 0) {
      if(m == 0) {
        if(S[i] == 'a') x++;
        else if(S[i] == 'b') {
          y++;
          m = 1;
        } else {
          z++;
          m = 2;
        }
      } else if(m == 1) {
        if(S[i] == 'a') {
          y++;
          m = 2;
        } else if(S[i] == 'b') {
          z++;
          m = 0;
        } else {
          x++;
          m = 1;
        }
      } else {
        if(S[i] == 'a') {
          z++;
          m = 1;
        } else if(S[i] == 'b') {
          x++;
          m = 2;
        } else {
          y++;
          m = 0;
        }
      }
    } else {
      if(m == 0) {
        if(S[i] == 'a') x--;
        else if(S[i] == 'b') {
          z--;
          m = 1;
        } else {
          y--;
          m = 2;
        }
      } else if(m == 1) {
        if(S[i] == 'a') {
          z--;
          m = 2;
        } else if(S[i] == 'b') {
          y--;
          m = 0;
        } else {
          x--;
          m = 1;
        }
      } else {
        if(S[i] == 'a') {
          y--;
          m = 1;
        } else if(S[i] == 'b') {
          x--;
          m = 2;
        } else {
          z--;
          m = 0;
        }
      }
    }
    st.insert(make_tuple(x, y, z));
  }
  cout << st.size() << endl;
}