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

Example Input: ['5199', 'h', 'T', 'T', 'l', '1661', 'p']
Example Output: 6860

Example Input: ['j', '5269', '9307', '5873', '9967', 'B', 'm', '2163']
Example Output:
32579