def bubble_sort(array)
  n = array.length
  loop do
    swapped = false

    (n - 1).times do |i|
      if array[i] > array[i + 1]
        array[i], array[i + 1] = array[i + 1], array[i]
        swapped = true
      end
    end

    break unless swapped
  end

  array
end

if $0 == __FILE__
  puts 'Enter a list of numbers separated by space'

  list = gets
  bubble_sort(list)
  print list
end