input: Write a function to create a lambda expression in Python to filter a list of integers greater than 50. The function should return the filtered list.
  
  assert filter_integers([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filter_integers([10, 20, 30, 40, 60, 70])==[60, 70]
  assert filter_integers([1, 2, 3, 4, 5, 6, 7, 8, 9])==[]
  assert filter_integers([])==[]
  assert filter_integers([100, 150, 200, 250, 300])==[100, 150, 200, 250, 300]
output: def filter_integers(lst):
      return list(filter(lambda x: x > 50, lst))