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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	string S;
	cin >> S;
	int c_cnt = count(all(S), 'c');
	int w_cnt = count(all(S), 'w');
	c_cnt--; 
	cout << min(c_cnt, w_cnt) << endl;
	return 0;
}