input: Write a function that filters a list of integers greater than 50 using a lambda expression. The function should return the filtered list.
  
  def filter_greater_than_50(list1):
      return list(filter(lambda x: x > 50, list1))
  
  assert filter_greater_than_50([45, 12, 52, 89, 33, 99])==[52, 89, 99]
  assert filter_greater_than_50([10, 20, 30, 40, 50])==[]
  assert filter_greater_than_50([])==[]
  assert filter_greater_than_50([51, 52, 53, 54, 55])==[51, 52, 53, 54, 55]
  assert filter_greater_than_50([50, 60, 70, 80, 90])==[60, 70, 80, 90]
output: def filter_greater_than_50(list1):
      return list(filter(lambda x: x > 50, list1))