S = gets.chomp
N = S.size
def f(i)
  @dp ||= {}
  @dp[i] ||= if i == N
               0
             elsif S[i] == 'w'
               1 + f(i + 1)
             else
               f(i + 1)
             end
end
ans = (0...N).map {|i|
  if S[i] == 'c'
    m = f(i)
    m * (m - 1) / 2
  else
    0
  end
}.inject(:+)
puts ans