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', 'g', '7251', '5873', '59', '7345']

Ex Output:
20528


Ex Input:
['Y', '8169', '9067']

Ex Output:
17236


Ex Input:
['F', 'R', 's', 'O', '519', '1283', '1703', '4949', 'H', 'u', '3537', 'f']

Ex Output:

11991