(Python) The Longest Sub-List

Write a program that receives a list and returns the size of the longest sub-list in the list. The longest sublist could be the list itself. For instance, in the list [1,[2,3],[[4]], []] the longest sub-list is the list itself with a length of 4.

Sample Input

[1,[2, 3, [], 4],[[5], 6]]

Sample Output

4