input: Write a python function to check if all elements in a list are the same.
  assert check_list_elements([1, 1, 1, 1]) == True
  assert check_list_elements([1, 4, 1, 4, 1]) == False
  assert check_list_elements(['a', 'a', 'a']) == True
output: def check_list_elements(lst):
      return all(x == lst[0] for x in lst)