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:
['5947', 'n', '9431', '7629', '7643', 'N', '141', '2353', 'l', 'F', '9665', '9489', 'X', '4905', 'H', 'L', '985']

Ex Output:
58188


Ex Input:
['D', 'b', 'h', 'p', '1637']

Ex Output:
1637


Ex Input:
['Z', '6239', 'y', '5261', 'w', 'N', 'V', '8497', '1557', '9443', 'y', '5119', '7369', 'd', 'F', 'A']

Ex Output:

43485