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: ['8743', 'Y', 'O', '8265', '1029', '5689', 'F', 'j', 'Z', 'i', 'S', '1285', '737']
Example Output: 25748

Example Input: ['g', 'A', 'm', '4005', '8079', 'G']
Example Output: 12084

Example Input: ['V', 'g', 'Y', 'U', '3553', '7537']
Example Output:
11090