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