input: Write a function to filter a list of integers and return a new list containing only the integers greater than 50 using a lambda expression.
  assert filtered_list([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filtered_list([10, 20, 30, 40, 50, 60])==[60]
  assert filtered_list([55, 65, 75, 85, 95])==[55, 65, 75, 85, 95]
  assert filtered_list([1, 2, 3, 4, 5])==[]
  assert filtered_list([])==[]
output: def filtered_list(lst):
      return list(filter(lambda x: x > 50, lst))