#include <iostream>
#include <string>
using namespace std;
int main(){
	string S;
	cin >> S;
	int N = S.size();
	int c = 0;
	int w = 0;
	for (int i = 0; i < N; i++){
		if (S[i] == 'c'){
			c++;
		}
		if (S[i] == 'w'){
			w++;
		}
	}
	cout << min(c - 1, w) << endl;
}