class Solution:
    def imageSmoother(self, img: list[list[int]]) -> list[list[int]]:
        def createFilter(img: list[list], i: int, j: int) -> int:
            grid_sum: int = 0
            count: int = 0
            size: int = len(img)
            breadth: int = len(img[0])

            for row in range(i-1, i+2):
                for col in range(j-1, j+2):
                    if row >= 0 and row < size and col >= 0 and col < breadth:
                        grid_sum += img[row][col]
                        count += 1

            return int(grid_sum / count)

        rows: range = range(len(img))
        cols: range = range(len(img[0]))
        out: list = [ [None for col in cols] for row in rows]

        for row in rows:
            for col in cols:
                out[row][col] = createFilter(img, row, col)

        return out

img: list = [ [100, 200, 100], [200, 50, 200], [100, 200, 100] ]
expected: list = [ [137, 141, 137], [141, 138, 141], [137, 141, 137] ]

solution: Solution = Solution()
out: list = solution.imageSmoother(img=img)
print(out)
print(out == expected)