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:
['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']

Ex Output:
37812


Ex Input:
['n', 'm', 'Y', 'v']

Ex Output:
0


Ex Input:
['8759', 'e', '579', 't', 'j', '8883', 'R', 'p', 'L', '7713']

Ex Output:

25934