Given a 2D integer matrix $M$ representing the gray scale of an image, you need to design a smoother to make the gray scale of each cell becomes the average gray scale (rounding down) of all the $8$ surrounding cells and itself. If a cell has less than $8$ surrounding cells, then use as many as you can.

The first row gives two positive integers $n, m$ separated by spaces, representing the rows and columns of the matrix $(1≤n, m≤128)$

Next output $n$-row, $m$-column, represents matrix $M$ and the value in the given matrix is in the rangeof $[0, 255]$.

Output smoothed $n$-rows, $m$-column matrix $M$, no extra spaces at the end of each row