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:
['5573', '6221', 'C', '8649', '6603', 'q', '9403']

Ex Output:
36449


Ex Input:
['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']

Ex Output:
37812


Ex Input:
['5207', 'n', '6491', '527', '9315', '9377', 'y']

Ex Output:

30917