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:
['6815', 'A', '1055', '4687', '8675', '4615', 'a', '2127', 'w', 'l', 'J', '5025', 'c', 't', '9727', 'G', '8431']

Ex Output:
51157


Ex Input:
['89', '5965', '9463', 'k']

Ex Output:
15517


Ex Input:
['2895', '8095', 'y', '1927', '4827']

Ex Output:

17744