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:
['7831', 'O', '6017', 'v', 'U', '5761', 'Q', 'Q', 'w', '8465', 'Z', 'P', 'i', 'u', '1635', 'n', '8471', '4213']

Ex Output:
42393


Ex Input:
['R', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']

Ex Output:
20701


Ex Input:
['z', 'T', '9485', '5401', '4777', 'i', '8359', 'f', 'G', '2757', '6929', '9521', 'S', '2733', 'q', '2547', '9971']

Ex Output:

62480