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:
['8591', 'J', 'l', 'l', '7023', 'N', 'n']

Ex Output:
15614


Ex Input:
['5095', '8235', '4901', 's', '4177', '3077', 'l']

Ex Output:
25485


Ex Input:
['f', '2299', '2279', '6577', '9659', '8061', 'g', 'y', 'r', 'P', 'L', '285', 'A', '8463', '4955', 's', '9351']

Ex Output:

51929