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: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']
Example Output: 35458

Example Input: ['1319', '6105', '1119', 'c', 'p', '7617', '5113', 'a', '5115', '6731', '6693']
Example Output: 39812

Example Input: ['1589', '8257', 'L', 'R', '7723', '7481', 'n', '8063', 'y', 'V', 'G', 'n', '3261', '8967']
Example Output:
45341