def get_object_type(value_list):
  """
  value_list: an array of String class name reprentation
  return:  the first string represents Lime object class, not relation class
  """
  if not value_list:
    raise ValueError('Search to end, no object type found')
  try:
    t = locate(value_list[0]) # Use locate to get type from string representation
  except ValueError:
    print('Bad input string provided')

  if (t is not a relation type):
    return t
  else (t is a relation type):
    return get_object_type(value_list[1:])