#include <iostream>
#include <iomanip>
#include <vector>
typedef unsigned long long ul;
typedef signed long long ll;

int main(void)
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  std::cout << std::fixed << std::setprecision(2);
  std::string s;
  std::cin >> s;
  ll w = 0;
  ll ans = 0;
  for (ll i = s.size()-1; i >= 0; --i) {
    if (s[i] == 'w') w++;
    if (s[i] == 'c') ans += w * (w-1) / 2;
  }
  std::cout << ans << std::endl;
  return 0;
}