#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>
#include <map>
#include <set>
#include <cstdio>
#include <cmath>
#define rep(i,l,n) for(lint i=l;i<n;i++)
#define rer(i,l,n) for(lint i=l;i<=n;i++)
#define all(a) a.begin(),a.end()
#define o(a) cout<<a<<endl
using namespace std;
typedef long long lint;
typedef vector<int> vi;
typedef vector<lint> vli;
typedef vector<vi> vvi;
typedef pair<int,int> pii;

int main(){
	string s;
	cin>>s;
	vli d(s.size());
	rep(i,0,s.size()){
		if(s[i]=='w') d[i]++;
	}
	for(int i=s.size()-2;i>=0;i--){
		d[i]+=d[i+1];
	}
	lint ans=0;
	rep(i,0,s.size()){
		if(s[i]=='c'){
			lint tmp=0;
			tmp=d[i]*(d[i]-1)/2;
			ans+=tmp;
		}
	}
	o(ans);
}