#include<iostream>
#include<string>

using namespace std;

#define INF 100000

int comb(int a,int b){
	if(b==0) return 1;
	return comb(a-1,b-1)*a/b;
}

int main(){

	string s;
	int wc=0;
	int i;
	int itmp;
	int ans=0;
	cin>>s;

	for(i=0;i<s.size();i++){
		if(s[i]=='c') break;
	}
	if(i==s.size()-1){
		cout<<"0"<<endl;
		return 0;
	}

	itmp=i;

	for(;i<s.size();i++){
		if(s[i]=='w') wc++;
	}

	if(wc<2){
		cout<<"0"<<endl;
		return 0;
	}

	ans+=comb(wc,2);
	for(i=itmp+1;i<s.size();i++){
		if(s[i]=='w') wc--;
		if(wc<2) break;
		if(s[i]=='c') ans+=comb(wc,2);
	}

	cout<<ans<<endl;
}