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: ['w', '7301', '9411', 'z', 'g', 'X', '1045', 'l', 'F', 'M', 'R', '7957', 'e', '5145']
Example Output: 30859

Example Input: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
Example Output: 33865

Example Input: ['L', '3251', 'D', '4739', 'X', 'T', 'v', 'u', '2229', 'o', '9935', '8801', 'I', 'C', '7215', '1081', 'x']
Example Output:
37251