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: ['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']
Example Output: 27899

Example Input: ['8821', '7221']
Example Output: 16042

Example Input: ['1127', 'c', '3719', '1299', '3681', 'h', '351', 'Q', 'U', '7891']
Example Output:
18068