#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
//#define int long long
using namespace std;
typedef long long ll;

string S;

signed main()
{
	cin >> S;
	int clen = 0, wlen = 0;
	rep(i,S.length()) if (S[i] == 'c') {
		clen++;
	} else {
		break;
	}
	wlen = S.length() - clen;

	cout << min(clen - 1, wlen) << endl;
}