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: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']
Example Output: 14668

Example Input: ['2215', '4369', 'e', '4979', '4069', 'J', 'L', '789', 'w', 'p', '9533', '8523', '2531']
Example Output: 37008

Example Input: ['z', '1975', 'g', '6931', '4489', '7901', '693', 'j', '5717', '4077', '3491', '1867', 'e', '5287', 'g']
Example Output:
42428