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: ['N', 'V', 't', 'X', 't', 'M']
Example Output: 0

Example Input: ['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']
Example Output: 14270

Example Input: ['Q', '9395', 'B', 'w', 'l', 'q', 'r', '9839', 'x', 'G', '5215', '6911', 'K', 'D', '8441', '5327', 'G', 'J']
Example Output:
45128