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:
['9403', 'u', '4159', 'w', '3467']

Ex Output:
17029


Ex Input:
['m', 'g', '7251', '5873', '59', '7345']

Ex Output:
20528


Ex Input:
['I', 'G', '7007', '4345', 'B', '9857', '4411', '7427', 't', 'R', '5787', '1685', 'Q']

Ex Output:

40519