from typing import List

def insert(lst: List[int], v: int) -> None:

"""Insert v into lst just before the rightmost item greater than v, or at

index 0 if no items are greater than v.

>>> my_list = [3, 10, 4, 2]

>>> insert(my_list, 5)

>>> my_list

[3, 5, 10, 4, 2]

>>> my_list = [5, 4, 2, 10]

>>> insert(my_list, 20)

>>> my_list

[20, 5, 4, 2, 10]

"""