Return elements in first list but not in second.
Implement this function:
def list_difference(l1: list, l2: list) -> list:
Write the function only — the arguments are read for you and the return value is printed automatically.
Arguments arrive as one Python literal per line, in this order: l1, l2.
Input
[1, 2, 3, 4]
[2, 4]
Output
[1, 3]