input: Write a python function to sort a list of numbers in ascending order.
  assert sort_number([4, 2, 9, 1]) == [1, 2, 4, 9]
  assert sort_number([10, 5, 3, 8]) == [3, 5, 8, 10]
  assert sort_number([7, 7, 2, 2]) == [2, 2, 7, 7]
output: def sort_number(nums):
      return sorted(nums)