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: ['d', 'b', 'W', '3201', 'C', 'o', '5187', '9723', '8177', 'F', '6703', 'U', '1393', '1035', '3507', '5993', '3857', 'r', 'C', 'j']
Example Output: 48776

Example Input: ['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']
Example Output: 23009

Example Input: ['K', 'D', 'z', '2505', 'd', '6967', 'A', 'G']
Example Output:
9472