#include<bits/stdc++.h>
using namespace std;
#define ALL(x) begin(x),end(x)
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define mod 1000000007
using ll=long long;
const int INF=1000000000;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0},dy[]={0,1,0,-1};
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}

struct IOSetup{
    IOSetup(){
        cin.tie(0);
        ios::sync_with_stdio(0);
        cout<<fixed<<setprecision(12);
    }
} iosetup;
 
template<typename T>
ostream &operator<<(ostream &os,const vector<T>&v){
    for(int i=0;i<(int)v.size();i++) os<<v[i]<<(i+1==(int)v.size()?"":" ");
    return os;
}
template<typename T>
istream &operator>>(istream &is,vector<T>&v){
    for(T &x:v)is>>x;
    return is;
}

/*
(0,0)
a

  u
v   w


*/


// struct tri{
//     int u,v,w;
//     int x,y;
//     tri(int u,int v,int w,int x,int y):u(u),v(v),w(w),x(x),y(y){}
//     tri(){}    
// };

using P=pair<int,int>;

signed main(){
    int x=0,y=0;    

    string s;cin>>s;
    char lf='b',ri='c',tp='a';
    bool ue=true;
    set<P> st;
    st.insert(P(x,y));

    for(auto &c:s){
        if(ue){
            ue=false;

            if(c==lf){
                x++;
                char ntp=ri,nlf=tp,nri=lf;
                tp=ntp,lf=nlf,ri=nri;
            }
            else if(c==ri){
                x--;
                char ntp=lf,nlf=ri,nri=tp;
                tp=ntp,lf=nlf,ri=nri;
            }
            else if(c==tp){
                y++;
            }
        }else{
            ue=true;
            if(c==lf){
                x++;
                char ntp=ri,nlf=tp,nri=lf;
                tp=ntp,lf=nlf,ri=nri;
            }
            else if(c==ri){
                x--;
                char ntp=lf,nlf=ri,nri=tp;
                tp=ntp,lf=nlf,ri=nri;
            }
            else if(c==tp){
                y--;
            }
        }
        st.insert(P(x,y));
    }

    cout<<st.size()<<endl;
    return 0;
}