#include <algorithm>
#include <cmath>
#include <cstdio>
#include <deque>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

using namespace std;

typedef long long ll;

#define MOD 1000000007

int main() {
  string s;
  cin >> s;
  int n = s.size();
  vector<ll> sum(n);
  for (int i = 0; i < n; ++i) {
    if (s[i] == 'w') {
      sum[i]++;
    }
  }
  for (int i = n - 2; i >= 0; --i) {
    sum[i] += sum[i + 1];
  }
  ll ans = 0;
  for (int i = 0; i < n; ++i) {
    if (s[i] == 'c') {
      ans += sum[i] * (sum[i] - 1) / 2;
    }
  }
  cout << ans << endl;
  return 0;
}