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.

Example Input: ['3877', '2685', 'f', 'r', 'q', 'o', 'k', 'i', '2299', '9075', 'X', '4303', '7379', '9205', 'V', '9655', 's']
Example Output: 48478

Example Input: ['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']
Example Output: 37812

Example Input: ['9967', '5467', 'S', 'G', 'c', '575', '6585', '6557', 'j', '5747', '3843', 'x', 'K', 'f']
Example Output:
38741