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:
['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

Ex Output:
27756


Ex Input:
['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']

Ex Output:
15717


Ex Input:
['n', '9979', 'U', '7043', 'w', 'I', 'y', 'L', 'Y', '1345', 'v', 'P', '5609', '7551']

Ex Output:

31527