#include<iostream>
#include<vector>
#include<string>
#include<algorithm>	
#include<map>
#include<set>
#include<utility>
#include<cmath>
#include<cstring>
#include<queue>
#include<cstdio>
#include<sstream>
#include<iomanip>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb push_back
#define mp make_pair
#define all(in) in.begin(),in.end()
#define shosu(x) fixed<<setprecision(x)
using namespace std;
//kaewasuretyuui
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<pii> vp;
typedef vector<vp> vvp;
typedef pair<int,pii> pip;
typedef vector<pip>vip;
const double PI=acos(-1);
const double EPS=1e-8;
const ll inf=1e17;
int main(){
	string s;
	cin>>s;
	int n=s.size();
	vi sum(n+1);
	for(int i=n-1;i>=0;i--){
		sum[i]=sum[i+1]+(s[i]=='w'?1:0);
	}
	ll out=0;
	rep(i,n)if(s[i]=='c'){
		out+=sum[i]*(sum[i]-1)/2;
	}
	cout<<out<<endl;
}