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: ['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']
Example Output: 25220

Example Input: ['s', '3607', 'p', 'P', '9285', 'J', 'l', '9863', '9823', '2817', 'g', '9751', '599', '2605', 'k', 'Y', 'O', 'U', '9649']
Example Output: 57999

Example Input: ['H', '5087', 'x', 'G', '1803', '1781', '2093', '4641', '2883', 'W', '4599', 'U', 'G', '1957', 'F', '1739']
Example Output:
26583