<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_alpha(self, x: int, y: int) -> int: """Get the Image alpha of the pixel at x, y. Args: x (int):
 X pixel of the image. Starting from the left at 0. y (int):
 Y pixel of the image. Starting from the top at 0. Returns: int: The alpha value of the pixel. With 0 being fully transparent and 255 being fully opaque. """

        return lib.TCOD_image_get_alpha(self.image_c, x, y)