#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  string c, p = "";
  int ans = 0;
  cin >> s;
  for (int i = 0; i < s.size(); i++) {
    c += s[i];
    if (c == p) {
      continue;
    } else {
      cout << "current=" << c << endl;
      p = c;
      c = "";
      ans++;
    }
  }
  cout << ans << endl;
}
