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

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