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:
['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']

Ex Output:
35388


Ex Input:
['D', 'b', 'h', 'p', '1637']

Ex Output:
1637


Ex Input:
['c', '9505', '3145', 'N', 't', '8843', 'e', '277', '913']

Ex Output:

22683