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:
['3497', '761', '6157', 'J', 'n', '139', '9895', '2939', 'K', 'I', '2161', 'c', 'a', '485', '7959', 'i', '4753', '3305', 'G', '3475']

Ex Output:
45526


Ex Input:
['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Ex Output:
35458


Ex Input:
['m', '39', '7025']

Ex Output:

7064