input: Write a python function to filter elements that start with 'A' in a list.
  assert startWithA(['Apple', 'Banana', 'Apricot', 'Cherry']) == ['Apple', 'Apricot']
  assert startWithA(['Ant', 'Bat', 'Cat', 'Alligator']) == ['Ant', 'Alligator']
  assert startWithA(['Dog', 'Elephant', 'Fish']) == []
output: def startWithA(lst):
      return [item for item in lst if item.startswith('A')]