input: Write a function that takes a list of integers and returns a new list containing only the integers greater than 50. Use a lambda expression to filter the list.
  
  assert filter_integers([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filter_integers([51, 60, 49, 35])==[51, 60]
  assert filter_integers([50, 50, 50])==[]
  assert filter_integers([])==[]
output: def filter_integers(lst):
      return list(filter(lambda x: x > 50, lst))