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', 'O', '7023', 'q', '2667', '681', 'C', '5707', '7125', 'q', 'Q', '1375', '8869', '6709']

Ex Output:
40156


Ex Input:
['Z', '6245', 'N', '1403', 'b']

Ex Output:
7648


Ex Input:
['9749', '3689', 'f', '1491', 'w', '5149', 'k', 'q', '6685', 'X']

Ex Output:

26763