input: Write a function to filter a list of integers and return only those integers that are greater than 50 using a lambda expression. If the input list is empty, return an empty list.
  assert filter_greater_than_50([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filter_greater_than_50([60, 72, 48, 55])==[60, 72, 55]
  assert filter_greater_than_50([])==[]
  assert filter_greater_than_50([30, 40, 50, 60])==[60]
output: def filter_greater_than_50(lst):
      return list(filter(lambda x: x > 50, lst))