from typing import Set
from typing import Tuple


def get_corners(lights_length: int, lights_height: int) -> Set[Tuple[int, int]]:
    """ 
    Gets the coordinates of the four corners, given an x size and y size

    Args:
        lights_length (int): x size
        lights_height (int): y size

    Returns:
        Set[Tuple[int, int]]: A set of four (x, y) coords
    """

    on_lights_to_add = set()

    on_lights_to_add.add((0, 0))
    on_lights_to_add.add((lights_length-1, 0))
    on_lights_to_add.add((0, lights_height-1))
    on_lights_to_add.add((lights_length-1, lights_height-1))

    return on_lights_to_add