#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const long long INF = 1001001001;
const long long MOD = /**/1000000007;//*/998244353;
const double EPS = 1e-10;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    string s;
    cin>>s;
    map<pair<int,int>,int> mp;
    int t=1,y=202020,x=202020;
    mp[make_pair(y,x)]++;
    for(int i=0;i<s.size();i++){
        if(s[i]=='a'){
            x+=t;
            mp[make_pair(y,x)]++;
            t*=-1;
        }
        if(s[i]=='b'){
            x-=t;
            mp[make_pair(y,x)]++;
            t*=-1;
        }
        if(s[i]=='c'){
            y+=t;
            mp[make_pair(y,x)]++;
            t*=-1;
        }
    }
    int ans=0;
    for(auto v:mp)ans++;
    cout<<ans<<endl;
}