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:
['3839', 'D', '4741', 'L']

Ex Output:
8580


Ex Input:
['2225', '1925']

Ex Output:
4150


Ex Input:
['6523', '8059', '9273', 'C', 'm', '8503', 'H', '1207', 'E', '4449', 'A', '7389', 'D']

Ex Output:

45403