#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  string s;
  cin >> s;

  vector<int> hist(s.length()+1);

  REP (i, s.size()) {
    hist[i+1] = hist[i];
    if (s[i] == 'w')
      hist[i+1]++;
  }

  long long ret = 0;
  REP (i, s.size()) {
    if (s[i] == 'c') {
      long long w = hist[s.size()] - hist[i];
      ret += w * (w-1) / 2;
    }
  }
  
  cout << ret << endl;
  
  return 0;
}