def surfaceArea(A): B = list((zip(*A)))

def sides(l):
    lst = []
    for i in l:
        l_r = i[0]
        for j in range(1, len(l[0])):
            if i[j] > i[j - 1]:
                l_r += i[j] - i[j - 1]
        lst.append(l_r)
    return sum(lst)*2

return sides(A) + sides(B) + len(A)*len(A[0])*2