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:
['L', 'w', '2783', '6993', 'd', '9173']

Ex Output:
18949


Ex Input:
['6293', 'o']

Ex Output:
6293


Ex Input:
['A', '4235', '3595', '45', 'K', '8981', '5349']

Ex Output:

22205