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

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