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:
['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

Ex Output:
27756


Ex Input:
['d', '4553']

Ex Output:
4553


Ex Input:
['t', 'a', 'K', 'R', '4725', '4299', '8921', 'y']

Ex Output:

17945