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:
['D', 'K', 'n', 'd', 'i', 'U']

Ex Output:
0


Ex Input:
['7361', '6913', '3605', '2081', '7619']

Ex Output:
27579


Ex Input:
['R', 's', '7495']

Ex Output:

7495