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: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
Example Output: 12302

Example Input: ['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']
Example Output: 25298

Example Input: ['4011', '901', 'X', 'n', 'k', '2261', 'N', 'x', '8873']
Example Output:
16046