input: Write a python function to get the list of numbers from a ListOfInts object.
  ```python
  assert get_numbers(ListOfInts([1, 2, 3, 4, 5])) == [1, 2, 3, 4, 5]
  assert get_numbers(ListOfInts([10, 20, 30])) == [10, 20, 30]
  assert get_numbers(ListOfInts([7, 8, 9])) == [7, 8, 9]
output: def get_numbers(list_of_ints):
      return list_of_ints.numbers
  
  class ListOfInts:
      def __init__(self, numbers):
          self.numbers = numbers