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: ['7277', 'c', '9587', '2613', '853', 'w', 'y', '4067', 'o', 'u', 'j', 'W', '1517', 'x', 'Y']
Example Output: 25914

Example Input: ['O', 'w', '3817', '4057']
Example Output:
7874