#include <bits/stdc++.h>
using namespace std;
#include <math.h>
#include <iomanip>
#include <cstdint>
#include <string>
#include <sstream>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
#define rep(i,n) for (int i = 0; i < (n); ++i)
typedef long long ll;
using P = pair<int,int>;
const int INF=1001001001;
const int mod =1e9+7;
int main() {
  string s;cin>>s;
  set<pair<int,int>>c;
  int x=0,y=0;
  c.insert({x,y});
  string now="abc";
  int isrev=0;
  for(char t:s){
    if(!isrev){//x軸と平行な辺=now[1],左へ移動する辺=now[0],右=now[2].
      if(t==now[0]){
        x--;y++;
        swap(now[1],now[2]);swap(now[0],now[2]);
      }
      else if(t==now[1]){
        y--;
      }
      else{
        x++;y++;
        swap(now[0],now[1]);swap(now[0],now[2]);
      }
      isrev^=1;
    }
    else{
      if(t==now[0]){
        x--;y--;
        swap(now[1],now[2]);swap(now[0],now[2]);
      }
      else if(t==now[1]){
        y++;
      }
      else{
        x++;y--;
        swap(now[0],now[1]);swap(now[0],now[2]);
      }
      isrev^=1;
    }
    c.insert({x,y});
  }
  cout<<c.size()<<endl;
  return 0;
}