#include <bits/stdc++.h>
    #define hell                         1000000007 
    #define M                            1000000007
    #define Maxi                      10000000000000000
        #define lcm(a,b)                     (a*b)/__gcd(a,b)
        #define ll                           long long

        #define vll                          vector<ll>
        #define vi                           vector<long long>
        #define pll                          vector< pair<ll,ll> >
        #define pb                           push_back
        //#define mp                           make_pair
        #define all(v)                       v.begin(),v.end()
        #define lbnd                         lower_bound
        #define ubnd                         upper_bound
        #define bs                           binary_search
        #define F                            first
        #define S                            second
        #define rep(i,a,b)                   for(i=a;i<b;i++)
        #define parr(a,n)                    for(i=0;i<n;i++) cout<<a[i]<<" ";cout<<endl;
        #define pcont(a)                     for(auto i:a) cout<<i<<" ";cout<<endl;
        #define ret(x)                       return cout<<x,0;
        #define dbg(x)                       cout << #x << " is " << x << endl;
        //#define endl                           '\n'
     
     
        // Debug //
     
        #define trace(x)                 cerr << #x << ": " << x << endl;
        #define trace1(x)                cerr << #x << ": " << x << endl;
        #define trace2(x, y)             cerr << #x << ": " << x << " | " << #y << ": " << y << endl;
        #define trace3(x, y, z)          cerr << #x << ": " << x << " | " << #y << ": " << y << " | " << #z << ": " << z << endl;
        #define trace4(a, b, c, d)       cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << endl;
        #define trace5(a, b, c, d, e)    cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << endl;
        #define trace6(a, b, c, d, e, f) cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << " | " << #f << ": " << f << endl;


    using namespace std;
    
    
    int main()
    {

         ios_base::sync_with_stdio(false);
         cin.tie(NULL);cout.tie(NULL);
      
        string s;
        cin>>s;
        ll n;
        n=s.size();
        if(n==1)
        {
            cout<<1<<endl;
        }
        ll st=0;
        ll c=1;
        ll i;
        ll j;
        string w="";
        w+=s[0];
        for(i=1;i<n;i++)
        {
            j=i;
            string w2="";
            w2+=s[j];
            while(st<i && j<n && w2.size()!=0 && w==w2 )
            {
                w2+=s[j];
                j++;
            }
            if(j==n)
            {
                break;
            }
            else
            {
                w=w2;
                //cout<<i<<" "<<j<<endl;
                c++;
                st=i;
                i=j;
            }
        }
        cout<<c<<endl;

        return 0;

    }


  



Measured memory_bytes: 720