input: Write a function to filter a list of integers to include only those greater than 50. If the list is empty, return an empty list.
  assert filtered_list([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filtered_list([60, 70, 80, 90])==[60, 70, 80, 90]
  assert filtered_list([30, 40, 20, 10])==[]
  assert filtered_list([])==[]
output: def filtered_list(lst):
      return [x for x in lst if x > 50]