#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;

int main() {
	int mon;
	string h;
	cin >> h;
	map<int, int>m;
	for (auto&&i : h) {
		++m[i];
	}
	cout << min(m['c'] - 1, m['w']) << endl;
}