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: ['8207', '4791', '3925', 'b', 'Z', '8471', '9215', '3117', 'p', '9095', 'h', 'k', 'E', 'h', '6047']
Example Output: 52868

Example Input: ['W', 'H', 'k', 'L', '2425']
Example Output: 2425

Example Input: ['B', 'Q', '9219', '3017', 'H', 'o', 'N', 'L', '9881', 'e', 'b', '6071', '993', 'U', '3369', '261', '8929']
Example Output:
41740