#ifndef KOMAKI_LOCAL
#define NDEBUG
#endif

#include <bits/stdc++.h>
#include <sys/time.h>
#include <unistd.h>
using namespace std;
#define i64         int64_t
#define rep(i, n)   for(i64 i = 0; (i) < ((i64)(n)); ++(i))
#define bit(n)      (((i64)1)<<((i64)(n)))
#define sz(v)       ((i64)((v).size()))

std::string dbgDelim(int &i){ return (i++ == 0 ? "" : ", "); }
#define dbgEmbrace(exp) { int i = 0; os << "{"; { exp; } os << "}"; return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::vector<T> v);
template <class T> std::ostream& operator<<(std::ostream &os, std::set<T> v);
template <class T> std::ostream& operator<<(std::ostream &os, std::queue<T> q);
template <class T> std::ostream& operator<<(std::ostream &os, std::priority_queue<T> q);
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::pair<T, K> p);
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::map<T, K> mp);
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::unordered_map<T, K> mp);
template <int INDEX, class TUPLE> void dbgDeploy(std::ostream &os, TUPLE _){}
template <int INDEX, class TUPLE, class H, class ...Ts> void dbgDeploy(std::ostream &os, TUPLE t){ os << (INDEX == 0 ? "" : ", ") << get<INDEX>(t); dbgDeploy<INDEX + 1, TUPLE, Ts...>(os, t); }
template <class T, class K> void dbgDeploy(std::ostream &os, std::pair<T, K> p, std::string delim){ os << "(" << p.first << delim << p.second << ")"; }
template <class ...Ts> std::ostream& operator<<(std::ostream &os, std::tuple<Ts...> t){ os << "("; dbgDeploy<0, std::tuple<Ts...>, Ts...>(os, t); os << ")"; return os; }
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::pair<T, K> p){ dbgDeploy(os, p, ", "); return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::vector<T> v){ dbgEmbrace( for(T t: v){ os << dbgDelim(i) << t; }); }
template <class T> std::ostream& operator<<(std::ostream &os, std::set<T> s){ dbgEmbrace( for(T t: s){ os << dbgDelim(i) << t; }); }
template <class T> std::ostream& operator<<(std::ostream &os, std::queue<T> q){ dbgEmbrace( for(; q.size(); q.pop()){ os << dbgDelim(i) << q.front(); }); }
template <class T> std::ostream& operator<<(std::ostream &os, std::priority_queue<T> q){ dbgEmbrace( for(; q.size(); q.pop()){ os << dbgDelim(i) << (T) q.top();   }); }
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::map<T, K> mp){ dbgEmbrace( for(auto p: mp){ os << dbgDelim(i); dbgDeploy(os, p, "->"); }); }
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::unordered_map<T, K> mp){ dbgEmbrace( for(auto p: mp){ os << dbgDelim(i); dbgDeploy(os, p, "->"); }); }
#define DBG_OUT std::cerr
#define DBG_OVERLOAD(_1, _2, _3, _4, _5, _6, macro_name, ...) macro_name
#define DBG_LINE() { char s[99]; sprintf(s, "line:%3d | ", __LINE__); DBG_OUT << s; }
#define DBG_OUTPUT(v) { DBG_OUT << (#v) << "=" << (v); }
#define DBG1(v, ...) { DBG_OUTPUT(v); }
#define DBG2(v, ...) { DBG_OUTPUT(v); DBG_OUT << ", "; DBG1(__VA_ARGS__); }
#define DBG3(v, ...) { DBG_OUTPUT(v); DBG_OUT << ", "; DBG2(__VA_ARGS__); }
#define DBG4(v, ...) { DBG_OUTPUT(v); DBG_OUT << ", "; DBG3(__VA_ARGS__); }
#define DBG5(v, ...) { DBG_OUTPUT(v); DBG_OUT << ", "; DBG4(__VA_ARGS__); }
#define DBG6(v, ...) { DBG_OUTPUT(v); DBG_OUT << ", "; DBG5(__VA_ARGS__); }

#define DEBUG0() { DBG_LINE(); DBG_OUT << std::endl; }
#define DEBUG(...)                                                      \
  {                                                                     \
    DBG_LINE();                                                         \
    DBG_OVERLOAD(__VA_ARGS__, DBG6, DBG5, DBG4, DBG3, DBG2, DBG1)(__VA_ARGS__); \
    DBG_OUT << std::endl;                                               \
  }




i64 dp[10][200500];
i64 recur(i64 pos, i64 prev, string &s)
{
  if(pos == sz(s)) return 0;
  i64 &res = dp[prev][pos];
  if(res != -1) return res;
  res = 0;
  rep(i, 10)if(i){
    if(sz(s) < pos + i) continue;
    if(prev == i){
      bool diff = false;
      rep(j, i) diff |= (s[pos + j] != s[pos - prev + j]);
      if(!diff) continue;
    }
    res = max(res, recur(pos + i, i, s) + 1);
  }
  return res;
}

int main()
{
  memset(dp, -1, sizeof(dp));
  string s;
  cin >> s;
  cout << recur(0, 0, s) << endl;
}

Measured memory_bytes: 34308