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: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
Example Output: 45451

Example Input: ['9445', '7291', 'r', 'g', '1175', '7823', '5507', 'j', '7249', '6335', '3853', 'b', 'u', 'S', '365', 'Z', '7489', 'S', 'W', 'e']
Example Output: 56532

Example Input: ['6789', 'k', 'J', '6341', '1421', 'e', '7597', '6417', 'S', '5891', '6309', '937', 'B']
Example Output:
41702