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:
['B', 'u', '9227', 'b', '8767']

Ex Output:
17994


Ex Input:
['q', 'I', 'E', 'M', 'T', 'i', '8719', 'r', 'V', '9759', 'I', '1793', 'Q', 'P', '5263', 'I', 'O', '8603', 'y']

Ex Output:
34137


Ex Input:
['8599', '169', 't', 'B', 'p', '2115', 'W', '8121', '717', 'Q']

Ex Output:

19721