#include <iostream>

using namespace std;
 
int main() {
  string s;
  cin >> s;
  int c;
  int w;
  for(int i = 0; i < s.length(); i++) {
    if(s[i] == 'c') c++;
    if(s[i] == 'w') w++;
  }
  cout << min(c - 1, w) << endl;
  return 0;
}