S = gets.chomp
W = Array.new(S.size + 1, 0)
(1 .. S.size).each do |i|
  W[i] = W[i - 1] + (S[i - 1] == 'w' ? 1 : 0)
end
ans = S.size.times.inject(0) do |s,i|
  w = W[S.size] - W[i]
  if S[i] == 'c' && w >= 2
    s + w * (w - 1) / 2
  else
    s
  end
end
puts ans