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:
['l', 'B', 'Y', '7543', '5091', '1917']

Ex Output:
14551


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

Ex Output:
17925


Ex Input:
['3707', 'T', '3617', '2739', 'v', '1731', '3973', '1959', '6017', '1239']

Ex Output:

24982