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

Example Input: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
Example Output: 5636

Example Input: ['O', 'Q', '5619', '9667', 'O', 'n', 'G', '65', '583', 'g', '4609', 'k', '7091', 'N', '5039', '1191']
Example Output:
33864