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:
['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']

Ex Output:
45451


Ex Input:
['z', '9173', 's', '8937', 'h', '1881', '7929', 'b', '2441']

Ex Output:
30361


Ex Input:
['i', 'd', '5267', '417', '4327', '5713', 'B']

Ex Output:

15724