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: ['8683', 'p', '47', '8983', 'g', 'u']
Example Output: 17713

Example Input: ['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']
Example Output: 56499

Example Input: ['7883', 's', 'b', 'f', 'i', '1947', '5773', '2113', 'X', 'h', '4815', '411', 'J', 'E', '235', '8417', '9955', 'Z']
Example Output:
41549