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:
['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Ex Output:
35458


Ex Input:
['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

Ex Output:
17925


Ex Input:
['4855', 'i', '6803', 'T', 'B', 'M', '5105', '3867', '2161', '9809', '3487', '5291', 'w', '9749', '6783', '4955', '8879', 'W', 'p']

Ex Output:

71744