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: ['o', '7099', 'G', 'v', 'H', 'J', 'k', '1607', 'i', '9765', '2489', '8031']
Example Output: 28991

Example Input: ['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']
Example Output: 18610

Example Input: ['S', '1993', 'l', '8455', '7957', '6663', 'L', 'X']
Example Output:
25068