#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#ifdef __unix__
#include <bits/stdc++.h>
#else
#include "bits\stdc++.h"
#endif
#include <vector>
#include <set>
#include <string>
#include <queue>
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

#define SIZE 10

enum Muki{
  up,r,down,l
};

template<typename T>
T combi(T n,T r) {
  T i,j;
  T rep = 1;
  if(n < r) return 0;
  if(r > n/2) r = n-r;
  rep(i,r) rep *= n-i;
  rep(i,r) rep /= r-i;
  return rep;
}

int main() {
  int i,j;
  cin.tie(0);
  ios::sync_with_stdio(false);
  static char s[100005];
  static int  a[100005];
  ull sum = 0;
  ull cnt = 0;
  cin >> s;
  for(i=sizeof(s)-1;i>-1;i--) {
    if(s[i] == 'w') cnt++;
    a[i] = cnt;
  }
  for(i=0;s[i];i++) {
    if(s[i] == 'c') {
      sum += combi((ull)a[i],(ull)2);
    }
  }
  cout << sum << endl;
  return 0;
}