#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
 
using namespace std;
 
#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
 
#define MOD 1000000007

int d[100005];

int main(){
  string s;
  cin>>s;
  clr(d,0);
  for(int i = s.sz-1; i>=0 ; i--){
    if(s[i]=='w'){
      d[i]++;
    }
    d[i]+=d[i+1];
  }
  long long ans = 0;
  rep(i,0,s.sz){
    if(s[i]=='c'){
      if(d[i]>1){
        ans += 1LL*d[i]*(d[i]-1)/2;
      }
    }
  }
  cout << ans << endl;
  return 0;
}