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:
['v', '3135', 'J', 'm', 'a']

Ex Output:
3135


Ex Input:
['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']

Ex Output:
15672


Ex Input:
['2765', '6767', '7645']

Ex Output:

17177