input: Write a python function to return a random element from a list.
  assert random_element([1, 2, 3, 4, 5]) in [1, 2, 3, 4, 5]
  assert random_element(['a', 'b', 'c', 'd', 'e']) in ['a', 'b', 'c', 'd', 'e']
  assert random_element([10, 20, 30, 40, 50]) in [10, 20, 30, 40, 50]
output: import random
  
  def random_element(lst):
      return random.choice(lst)