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:
['2237', '2597', '2593', 'Y', '5345', 'g', 'l', 'I', 'p', 'u', 'L', 'T', '617', '9759', 'b', 'w', '7097', '9863']

Ex Output:
40108


Ex Input:
['D', 'R', 'Y', '4929', 'P', '7929']

Ex Output:
12858


Ex Input:
['1431', 'F', '9545', '9515', 'a', '8121', '6591', '6003', '5477', '6279', '3777', '1493', '935', 'g', '9439', '7715', 't', '5719', 'r', 'o']

Ex Output:

82040