#include <iostream>
#include <cstdint>
#include <string>

using namespace std;

int main() {

  ios::sync_with_stdio(false);
  cin.tie(0);

  string s;
  cin >> s;
  uint64_t ans = 0;
  uint64_t w = 0;
  for (int i = s.size() - 1; 0 <= i; i--) {
    if (s.at(i) == 'w') {
      w++;
      continue;
    }
    if (s.at(i) == 'c') {
      ans += w * (w - 1) / 2;
    }
  }
  cout << ans << endl;
}