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:
['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']

Ex Output:
14578


Ex Input:
['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

Ex Output:
35729


Ex Input:
['6463', '2615', '8983', 'v', 'R', 'u', '5119', '387', 'E', 'Q', 'v', '4117', '4711', '7825']

Ex Output:

40220