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', 'U', 'I', '5245', 'g', 'Y', 's', 'V', 'b', 'V', 'D', '1193', 'p']

Ex Output:
6438


Ex Input:
['3121', 'j']

Ex Output:
3121


Ex Input:
['8899', 'U', 'P', '7113', '275', 'o', '713', '3489']

Ex Output:

20489