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:
['q', '867', 'e', 'z']

Ex Output:
867


Ex Input:
['Y', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']

Ex Output:
21405


Ex Input:
['9395', 'R', 'V']

Ex Output:

9395