upwork_task.rb

def sort(str)
  arr = str.split(" ")
  
  words = arr.map.with_index do |e, idx|
    next if e =~ /-?\d+/
    [idx, e]
  end.compact
  
  nums = arr.map.with_index do |e, idx|
    next unless e =~ /-?[0-9]/
    [idx, e]
  end.compact
  
  sorted_words = words.sort_by { |x| x.last }
  sorted_nums = nums.sort_by { |x| x.last }
  
  w = words.map.with_index do |w, idx|
    [w[0], sorted_words[idx][1]]
  end
  
  n = nums.map.with_index do |n, idx|
    [n[0], sorted_nums[idx][1]]
  end
  
  result = (w + n).sort_by { |x| x.first }.map { |x| x.last }.join(' ')

  puts result
end

sort('car truck 8 4 bus 6 1')
sort('8 4 6 1 -2 9 5')