#include <bits/stdc++.h>
using namespace std;

main()
{
  string str;
  cin >> str;

  int c = 0, w = 0;
  for (int i = 0; i < str.size(); i++){
    if (str[i] == 'c') c++;
    else w++;
  }

  
  cout << min(c - 1, w) << endl;
}