def pro_one(num) # 1..19
    return "" if num == 0
    %w(zero one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen)[num]
  end
  
  pro_one(5)

  def pro_ten(num) # 20..99
    return pro_one(num) if num < 20
    tens = %w(zero ten twenty thirty forty fifty sixty seventy eighty ninety)
    
    ten, one = num.to_s.split("").map{|i|i.to_i}
    return tens[ten] + " " + pro_one(one)
  end
  
  pro_ten(56)

def pro_hundred(num) #100..999
  return pro_ten(num) if num < 100
  return "one thousand" if num == 1000
  hun, ten_one = [num.to_s[0].to_i, num.to_s[1..2].to_i]
  return pro_one(hun) + " hundred and " + pro_ten(ten_one) if ten_one != 0
  return pro_one(hun) + " hundred"
end

pro_hundred(430)

(1..1000).to_a.map{|i| pro_hundred(i).gsub(/[ \-]/, "").length }.inject &:+

pro_hundred(115).gsub(/[ \-]/, "").length