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: ['2895', '8095', 'y', '1927', '4827']
Example Output: 17744

Example Input: ['4271', 'N', 'M', '5239', '7037', 'x', 'U', 's', '7107', '4163', 'f', '3607', '6155']
Example Output: 37579

Example Input: ['323', '5049', 'J', 'C', 'f', '5831', '2139', 'H', '5379', 'r', 'e', 'Q', 'o', '2363', 'O', 'i']
Example Output:
21084