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:
['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']

Ex Output:
8317


Ex Input:
['3331', '5791', 'r', 'Q', '2243', '8229']

Ex Output:
19594


Ex Input:
['u', 'R', 'd', '9193']

Ex Output:

9193