input: 
  def delete_duplicates(numbers: List[int]) -> List[int]:
      """ Deletes all duplicates in a given list of numbers and returns the list with unique elements.
      >>> delete_duplicates([1, 2, 2, 3, 4, 4, 5])
      [1, 2, 3, 4, 5]
      >>> delete_duplicates([5, 5, 5, 5])
      [5]
      """
      final_list = []
      for num in numbers:
          if num not in final_list:
              final_list.append(num)
      return final_list
  
output:     final_list = []
      for num in numbers:
          if num not in final_list:
              final_list.append(num)
      return final_list