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:
['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']

Ex Output:
40372


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

Ex Output:
14578


Ex Input:
['4347', '1967', '5001', '3305']

Ex Output:

14620