#include <bits/stdc++.h>
using namespace std;
int main() {
  string str;
  while (cin >> str) {
    int len = str.size();
    int times = 0;
    int c = 0, p = 0;
    char tmp;
    for (int i = int(0); i <= int(len - 1); i++) {
      c = 0, p = 0;
      tmp = str[i];
      if (tmp == 'C') {
        while (str[i] == tmp && i < len) {
          c++;
          if (c > 5) {
            break;
          }
          i++;
        }
        i--;
        times++;
      }
      if (tmp == 'P') {
        while (str[i] == tmp && i < len) {
          p++;
          if (p > 5) {
            break;
          }
          i++;
        }
        i--;
        times++;
      }
    }
    cout << times << endl;
  }
  return 0;
}
