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: ['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']
Example Output: 55013

Example Input: ['4749', '1169', '4273', 'X']
Example Output: 10191

Example Input: ['5329', 'x', 'd', 'K', '101', '9749', 'b', '8135', '8519', '9145', 'K', '7831']
Example Output:
48809