def is_lucky(ticket)
  return false if ticket =~ /\D/
  return false if ticket.length > 6
  return false if ticket.length < 6
  arr1 = (ticket).split("")[0..2]
  arr2 = (ticket).split("")[3..5]
  hey = arr1.reduce(0) { |a, s| a + s.to_i }
  bye = arr2.reduce(0) { |a, s| a + s.to_i }
  if hey == bye
    true
  else
    false
  end
end