input: 
  import random
  
  def shuffle_list(lst): 
      """ Shuffles a given list.
      >>> shuffle_list([1, 2, 3, 4, 5])
      [3, 5, 1, 2, 4]
      >>> shuffle_list(['a', 'b', 'c', 'd'])
      ['d', 'b', 'a', 'c']
      """
      random.seed()
      random.shuffle(lst)
      return lst
  
output:     random.seed()
      random.shuffle(lst)
      return lst