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: ['6367', '9923', '9141']
Example Output: 25431

Example Input: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
Example Output: 26791

Example Input: ['7705', 'A', 'l', 'b', '5231', 'W', '3121', '5139', 't', '8947', 'K', '9447', 'D', 'o']
Example Output:
39590