#!/usr/bin/env ruby

require 'optparse'

options = {}
options[:size] = 2

OptionParser.new do |opts|

  opts.banner = "Usage: #{$0} [OPTIONS]"

  opts.on('-s', '--size [NUMBER]', 'Size.') do |value|
    options[:size] = value.to_i
  end

end.parse!

required_options = [:size]
required_options.each do |option|
  unless options[option]
    $stderr.puts "Can not run #{option.to_s} was not given."
    exit 1
  end
end

options[:size].times do |i|
  puts ''
end

STDIN.each_line do |line|
  puts (' ' * options[:size]) + line.chomp + (' ' * options[:size])
end

options[:size].times do |i|
  puts ''
end