input: Write a function to swap the values of two variables. If either of the variables is missing, return "Input Missing". The function should return the swapped values as a tuple.
  assert swap_values(5, 10)==(10, 5)
  assert swap_values("hello", "world")==("world", "hello")
  assert swap_values(None, 7)== "Input Missing"
  assert swap_values(3, None)== "Input Missing"
  assert swap_values(None, None)== "Input Missing"
output: def swap_values(a, b):
      if a is None or b is None:
          return "Input Missing"
      return (b, a)