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:
['6669', 'n', 't', 'N', 'x', '8153', 'W', 'v', 'B', '3181', 'y', 'e', '3491']

Ex Output:
21494


Ex Input:
['s', 't', 'W', '163', 'v']

Ex Output:
163


Ex Input:
['1515', '2473', '2469', '6139', 'Y', 'q', 'F', '7193', 'q', '9185', 'c', 'b', 'V', '7231', '1789', '399', '3293', '937']

Ex Output:

42623