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

int main() {
  string s;
  cin >> s;
  int l = s.length();
  int c = 0;
  while (s[c] == 'c') {
	  c++;
	}
  int w = l - c;
  cout << min(c - 1, w) << endl;
  return 0;
}