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:
['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']

Ex Output:
24720

Ex Input:
['3351', '6445', 'Y', '8455', 'V', 'z', 'a', 'V', 'S', '8551', '4101', 'q', '8743', '5999', '7155', '3825', '2241', '9957']

Ex Output:
68823

Ex Input:
['4009', 'C', '7413', 'P', '2079', '8895', 'c', 'g', '1269', 'j', '2949', '207', '3711', 's', 'q', '7391', 'b', 'x', 'B']

Ex Output:
37923