s = gets.chomp

h = Hash.new{|s,k| s[k] = []}

for i in 0..(s.length-1) do
  case s[i]
  when "c" then h["c"] << i
  when "w" then h["w"] << i
  end
end

count = 0
h["c"].each do |i|
  ws = h["w"].select{|j| j > i}.size
  count += ws * (ws-1) / 2
end
puts count