input: Write a Python function that returns a list of only those positive integers from the input list that contain no even digits, sorted in ascending order.
  assert unique_digits([15, 33, 1422, 1]) == [1, 15, 33]
  assert unique_digits([152, 323, 1422, 10]) == []
  assert unique_digits([12345, 2033, 111, 151]) == [111, 151]
  assert unique_digits([135, 103, 31]) == [31, 135]
output: def unique_digits(numbers):
      def has_no_even_digits(n):
          return all(int(d) % 2 != 0 for d in str(n))
      return sorted([num for num in numbers if num > 0 and has_no_even_digits(num)])