#define _GLIBCXX_DEBUG
#define ll long long
#define INF 1000000000;
#define INF_B 1000000000000000000;
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  string S; cin >> S;
  int c = 0, w = 0;
  for(int i = 0; i < (int)S.size(); i++){
    S[i] == 'c' ? c++: w++;
  }
  cout << min(c-1, w) << endl;
}