input: Write a function to create a lambda expression in Python to filter a list of integers so that only those greater than 50 are retained. The function should return the filtered list.
  assert filtered_list([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filtered_list([5, 16, 66, 7, 51])==[66, 51]
  assert filtered_list([1, 2, 3, 4, 5])==[]
  assert filtered_list([50, 100, 51, 52, 50])==[100, 51, 52]
  assert filtered_list([])==[]
output: def filtered_list(lst):
      return list(filter(lambda x: x > 50, lst))