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.

Ex Input:
['1057', '3937']

Ex Output:
4994


Ex Input:
['4271', 'N', 'M', '5239', '7037', 'x', 'U', 's', '7107', '4163', 'f', '3607', '6155']

Ex Output:
37579


Ex Input:
['c', 'V', 'x', 'g', 'p', 'D', '8867', 'i']

Ex Output:

8867