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: ['d', 'b', 'W', '3201', 'C', 'o', '5187', '9723', '8177', 'F', '6703', 'U', '1393', '1035', '3507', '5993', '3857', 'r', 'C', 'j']
Example Output: 48776

Example Input: ['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']
Example Output: 9898

Example Input: ['2717', 'A', '6825', 'F', 'J', 'g', 'v', 'z', '7597', '3215', '8633', '1431']
Example Output:
30418