def get_item_details(color):
  """
    This function returns specification of Packgen based on color.
    :param color: It is color of the Packgen! Its possible values are red,yellow and green.
    :return:details,details is a dict containing information of packgen.It contains item,sku_alpha,priority,cost and Estimated Time of Delivery.
  """

  details = {'item':'Na','sku_alpha':'Na','priority':'Na','cost':'Na','Estimated Time of Delivery':'Na'}

  if color == 'red':
    details = {'item':'Medicines','sku_alpha':'R','priority':'HP','cost':'450','Estimated Time of Delivery':'1'}
  elif color == 'yellow':
    details = {'item':'Food','sku_alpha':'Y','priority':'MP','cost':'250','Estimated Time of Delivery':'3'}
  elif color == 'green':
    details = {'item':'Clothes','sku_alpha':'G','priority':'LP','cost':'150','Estimated Time of Delivery':'5'}

  return details