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:
['Y', '9053', 'N', '6921']

Ex Output:
15974


Ex Input:
['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

Ex Output:
35729


Ex Input:
['7833', 'i', 'Q', '2817', 'A', 'i']

Ex Output:

10650