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: ['s', '407', '7983', '1523', '8983', '9841', 'p', 'y', 'N', '7633', 'T', '4177', 'Z', 'Y', '3223', '7125', '2601', '7467', '3039']
Example Output: 64002

Example Input: ['4601', '6021', '3005', 'I', 'f', '4631', 'Q', 'd', '8041', 'D', '8067', '7383', '757', 't', 'd', 'n', '2275', 'p', 'm', '6021']
Example Output: 50802

Example Input: ['d', '9419', '1897', '5257', 'j', 'g', 'a', 'd', 'F', 'G', 'E', '9693', '5227', 'o', '273', '899', 'B']
Example Output:
32665