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:
['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']

Ex Output:
44566


Ex Input:
['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']

Ex Output:
19393


Ex Input:
['6999', '3717', 'w', 'o', 'y', '8097', 'Q']

Ex Output:

18813