Problem:
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Areas on the Cross-Section Diagram

Your task is to simulate a flood damage.

For a given cross-section diagram, reports areas of flooded sections.

Assume that rain is falling endlessly in the region and the water overflowing from the region is falling in the sea at the both sides.
For example, for the above cross-section diagram, the rain will create floods which have areas of 4, 2, 1, 19 and 9 respectively.

Input

A string, which represents slopes and flatlands by '/', '\' and '_' respectively, is given in a line. For example, the region of the above example is given by a string "\\///\_/\/\\\\/_/\\///__\\\_\\/_\/_/\".

output

Report the areas of floods in the following format:

$A$

$k$ $L_1$ $L_2$ ... $L_k$

In the first line, print the total area $A$ of created floods.

In the second line, print the number of floods $k$ and areas $L_i (i = 1, 2, ..., k)$ for each flood from the left side of the cross-section diagram. Print a space character before $L_i$.

Constraints

$1 \leq$ length of the string $\leq 20,000$

Sample Input 1

\\//

Sample Output 1

4
1 4

Sample Input 2

\\///\_/\/\\\\/_/\\///__\\\_\\/_\/_/\

Sample Output 2

35
5 4 2 1 19 9

Solution in Ruby (judge verdict: Accepted)

def main(input = input = STDIN.gets)
  input.chomp!

  y = 0
  stack = []

  input.chars.each_with_index do |ch, x|
    # puts "#{ch} (#{x}, #{y})"

    case ch
    when '\\' # DOWN
      y -= 1
      stack << [x, y]
    when '/'  # UP
      area = 0

      until stack.empty? || stack.all?{|e| e.is_a?(Integer)}
        case stack[-1]
        when Integer
          area += stack.pop
        when Array
          last_x, _ = stack.pop
          area += x - last_x
          break
        end
      end
      stack << area unless area.zero?

      y += 1
    when '_'
      # skip
    end
  end

  areas = stack.select{|e| e.is_a?(Integer) }

  puts areas.sum
  puts [areas.length, *areas].join ' '
end

main