#include <iostream>
#include <string>
using namespace std;

int main(void) {
  string s;
  int c, w;
  cin >> s;

  c = w = 0;
  for(int i = 0; i < s.size(); i++) {
    if(s[i] == 'c') c++;
    else if(s[i] == 'w') w++;
  }
  if(c < w) {
    cout << c-1 << endl;
  } else if(c > w) {
    cout << w << endl;
  } else if(c == w) {
    cout << c-1 << endl;
  }
  return 0;
}