input: Write a python function to return distinct numbers from a list.
  assert distinct_numbers([1, 2, 2, 3, 4, 4, 5]) == [1, 2, 3, 4, 5]
  assert distinct_numbers([5, 5, 5, 5, 5, 6, 6, 6, 7]) == [5, 6, 7]
  assert distinct_numbers([1, 2, 3, 4, 5]) == [1, 2, 3, 4, 5]
output: def distinct_numbers(numbers):
      return list(set(numbers))