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:
['2683', '4431']

Ex Output:
7114


Ex Input:
['5199', 'h', 'T', 'T', 'l', '1661', 'p']

Ex Output:
6860


Ex Input:
['6649', 'R']

Ex Output:

6649