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:
['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']

Ex Output:
39304


Ex Input:
['v', '3135', 'J', 'm', 'a']

Ex Output:
3135


Ex Input:
['C', 'E', '6429', 'S', 'K', 'H', '953']

Ex Output:

7382