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:
['k', '4991', '7289', '4355', 'I', '8415', '5175', '5329', 'G', 'a', '7193', 't', '8821', 'j', '7239', '405', 'y', 'O', '9881', 'w']

Ex Output:
69093


Ex Input:
['7771', 'g']

Ex Output:
7771


Ex Input:
['D', 'H', '6485', 'B', '2715', '715', '9203', 'M', '4331', 'f', '2831', '1787', 'h', 'd', '8991']

Ex Output:

37058