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: ['2625', '1611', 'E', '4507', '3013', '1569', 'M', '2607', '1111', 'W']
Example Output: 17043

Example Input: ['x', 'd', '5121', 'I', '6737', '3789', '6167', 'C', '8947', 'k', '4715', '1885', 'H', 'B', '5685', 'S', '4615', 's', '7709']
Example Output: 55370

Example Input: ['6543', '3127', 'G', 'w', 'B']
Example Output:
9670