S = gets.chomp
N = S.size
dp = Array.new(N + 1, 0)
(N - 1).downto(0) do |i|
  dp[i] = if S[i] == 'w'
            dp[i + 1] + 1
          else
            dp[i + 1]
          end
end
ans = (0...N).map {|i|
  if S[i] == 'c'
    m = dp[i]
    m * (m - 1) / 2
  else
    0
  end
}.inject(:+)
puts ans