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:
['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']

Ex Output:
26791


Ex Input:
['Y', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']

Ex Output:
21405


Ex Input:
['E', '6933', 'f', '9977', '9995', 'H', 'n', 'W', '6649', 'P', 'B']

Ex Output:

33554