#include<bits/stdc++.h>
using namespace std;
//#define int long long
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(c) (c).rbegin(),(c).rend()
#define mp make_pair
#define endl '\n'
#define vec vector<ll>
#define mat vector<vector<ll> >
#define fi first
#define se second
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pll;
typedef long double ld;
typedef complex<double> comp;
const ll INF=1e9+7;
const ll inf=INF*INF;
const ll MOD=1e9+7;
const ll mod=MOD;
const ll MAX=200010;
const double PI=acos(-1.0);



signed main(){
    string s;cin>>s;
    ll now=0;
    ll x=0,y=0;
    set<pll>st;
    ll n=s.size();
    st.insert(mp(x,y));

    rep(i,n){
        if(now==0){
            if(s[i]=='a'){
                now=1;
                x++;
            }else if(s[i]=='b'){
                now=3;
                y++;
            }else{
                now=5;
                x--;
            }
        }else if(now==1){
            if(s[i]=='a'){
                now=0;
                x--;
            }else if(s[i]=='b'){
                now=4;
                x++;
            }else{
                now=2;
                y--;
            }
        }else if(now==2){
            if(s[i]=='a'){
                now=3;
                x--;
            }else if(s[i]=='b'){
                now=5;
                x++;
            }else{
                now=1;
                y++;
            }
        }else if(now==3){
            if(s[i]=='a'){
                now=2;
                x++;
            }else if(s[i]=='b'){
                now=0;
                y--;
            }else{
                now=4;
                x--;
            }
        }else if(now==4){
            if(s[i]=='a'){
                now=5;
                y++;
            }else if(s[i]=='b'){
                now=1;
                x--;
            }else{
                now=3;
                x++;
            }
        }else{
            if(s[i]=='a'){
                now=4;
                y--;
            }else if(s[i]=='b'){
                now=2;
                x--;
            }else{
                now=0;
                x++;
            }
        }
        st.insert(mp(x,y));
    }
    cout<<st.size()<<endl;
}