input: Write a function to filter a list of integers and return only those values that are greater than 50 using a lambda expression in Python. The function should take a list of integers as input and return the filtered list.
  assert my_filter([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert my_filter([51, 50, 49, 100, 70])==[51, 100, 70]
  assert my_filter([30, 40, 20, 10])==[]
  assert my_filter([55, 60, 65])==[55, 60, 65]
  assert my_filter([])==[]
output: def my_filter(lst):
      return list(filter(lambda x: x > 50, lst))