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:
['6293', 'o']

Ex Output:
6293


Ex Input:
['j', 'f', '3831', 'B', 'D']

Ex Output:
3831


Ex Input:
['1485', 'T', '3641', 'O']

Ex Output:

5126