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: ['9211', '1889', '7371', '9649', 'b', 'y', 'q', 'a', 'i', '1137', '3291', '8625']
Example Output: 41173

Example Input: ['7087', 'P', 'i', 'e', '4875', 'e', 'F']
Example Output: 11962

Example Input: ['29', '805', '329', 'C', 'T', 'r', '8857', '5485', 'p', 'v', 'g', '2433', '495']
Example Output:
18433