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

int main()
{
	string S;
	cin >> S;

	int c = 0;
	for( int i = 0; i < S.size(); i++ ) {
		if( S[i] == 'c' ) c++;
	}
	int w = S.size() - c;
	int ans = 0;
	if( c >= 2 && w ) ans = min( c - 1, w );

	cout << ans << endl;
}