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: ['4601', '6021', '3005', 'I', 'f', '4631', 'Q', 'd', '8041', 'D', '8067', '7383', '757', 't', 'd', 'n', '2275', 'p', 'm', '6021']
Example Output: 50802

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

Example Input: ['9675', 'G', '9907', 'M', '9843', 'm', '2017', '3993', '7237', 'B', '9373', 'D', 'o', '8265', 'y', '6689', 'W', '5787', '4597']
Example Output:
77383