In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.

['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']
9898

['j', 'f', '3831', 'B', 'D']
3831

['2743', 'I', '3021', 'z', 'A', '4199', '5283', 'H', 'H']

15246