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:
['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']

Ex Output:
35766


Ex Input:
['N', 'V', 't', 'X', 't', 'M']

Ex Output:
0


Ex Input:
['g', '5517', 'B', '7071', 'j', '7903', '2313', '2795', 'a', 'Z', 'S', 'N', 'y', '3113', '6649', '8663']

Ex Output:

44024