input: Write a function to shuffle the elements of a list randomly.
  assert set(randomize([1, 2, 3, 4, 5])) == {1, 2, 3, 4, 5}
  assert set(randomize(['a', 'b', 'c', 'd'])) == {'a', 'b', 'c', 'd'}
  assert set(randomize([10, 20, 30])) == {10, 20, 30}
output: import random
  
  def randomize(lst):
      random.shuffle(lst)
      return lst