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:
['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']

Ex Output:
50770


Ex Input:
['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']

Ex Output:
15691


Ex Input:
['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']

Ex Output:

33509