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:
['U', '5607', 'Q', 'j', 'I', '3745', '3031']

Ex Output:
12383


Ex Input:
['D', 'm', 'P', '2433', '6731']

Ex Output:
9164


Ex Input:
['8931', 'N', '713', '2645', '4689', '6129']

Ex Output:

23107