input: Write a function to filter a list of integers and return only those values that are greater than 50. The function should use a lambda expression for filtering.
  list1 = [45, 12, 52, 89, 33, 99]
  filtered_list = filter_greater_than_50(list1)
  assert filtered_list == [52, 89, 99]
output: def filter_greater_than_50(lst):
      return list(filter(lambda x: x > 50, lst))