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:
['b', 's', 'v', '4757', '9063', 'I', '8397', '7975', 'Q']

Ex Output:
30192


Ex Input:
['k', 'a']

Ex Output:
0


Ex Input:
['1437', '1813', '8365', '6239', 'J', 'q', 'k', '8955', '2443']

Ex Output:

29252