cww = Hash.new(0)
cww[[-1, 0]] = 1

s = gets.strip
s.length.times do |i|
	cww[[i, 0]] = cww[[i - 1, 0]]
	cww[[i, 1]] = cww[[i - 1, 1]]
	cww[[i, 2]] = cww[[i - 1, 2]]
	cww[[i, 3]] = cww[[i - 1, 3]]
	if s[i] == "w"
		cww[[i, 3]] += cww[[i, 2]]
		cww[[i, 2]] += cww[[i, 1]]
	elsif s[i] == "c"
		cww[[i, 1]] += cww[[i, 0]]
	end
end
p cww[[s.length - 1, 3]]