#include <bits/stdc++.h>
using namespace std;
vector<string> split(const string& s, const string& delim = " ") {
  vector<string> res;
  string t;
  for (int i = 0; i != s.size(); i++) {
    if (delim.find(s[i]) != string::npos) {
      if (!t.empty()) {
        res.push_back(t);
        t = "";
      }
    } else {
      t += s[i];
    }
  }
  if (!t.empty()) {
    res.push_back(t);
  }
  return res;
}
vector<int> splitInt(const string& s, const string& delim = " ") {
  vector<string> tok = split(s, delim);
  vector<int> res;
  for (int i = 0; i != tok.size(); i++) res.push_back(atoi(tok[i].c_str()));
  return res;
}
template <typename T>
void print(T a) {
  cerr << a;
}
static void print(long long a) { cerr << a << "L"; }
static void print(string a) { cerr << '"' << a << '"'; }
template <typename T>
void print(vector<T> a) {
  cerr << "{";
  for (int i = 0; i != a.size(); i++) {
    if (i != 0) cerr << ", ";
    print(a[i]);
  }
  cerr << "}" << endl;
}
int main() {
  char s[200];
  while (scanf("%s", s) != EOF) {
    int res = 0;
    for (int i = 0, _n = (strlen(s)); i < _n; i++) {
      if (s[i] == 'C' || s[i] == 'P') {
        char temp = s[i];
        int j = i;
        while (j < i + 5 && temp == s[j]) {
          s[j] = '0';
          j++;
        }
        res++;
      }
    }
    printf("%d\n", res);
  }
  return 0;
}
