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:
['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']

Ex Output:
12030


Ex Input:
['9787', '1491', '4411', '5261', 'U', '9787', 'b']

Ex Output:
30737


Ex Input:
['6761', 'I', '5929', 'C', '6579', '5521', 'N', 'L', 'E']

Ex Output:

24790