#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
using namespace std;

#define ll long long
#define INF (1 << 30)
#define INFLL (1LL << 60)

#define FOR(i,a,b) for(ll i = (a);i<(b);i++)
#define REP(i,a) FOR(i,0,(a))
#define MP make_pair

int main() {
	string str;
	cin >> str;
	int c = 0,w = 0;
	for(int i = 0;i < str.size();i++){
		if(str[i] == 'c') c++;
		else w++;
	}
	cout << min(c, w) << endl;
	return 0;
}