im fkn retarded

class Solution:
    def imageSmoother(self, M: List[List[int]]) -> List[List[int]]:
        w=len(M[0])
        h=len(M)
        c=[]
        for y in range(0,h):
            l=[]
            m=[]
            r=[]
            for i in range(y-1,y+2):
                    if i>=0 and i<h:
                        m.append(M[i][0])
                        if w>1:
                            r.append(M[i][1])
            R=[]
            for x in range(1,w+1):
                R.append((int)(sum(l+m+r)/(len(l+m+r))))
                l=m
                m=r
                r=[]
                for i in range(y-1,y+2):
                    if i>=0 and i<h and x+1<w:
                        r.append(M[i][x+1])
            c.append(R)
        return c