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: ['2097', '7815', 'f', '1705', '7553', 'C', 'n', '7091', '1253', 'z', '9229', 'H', 'N', '6481', 'H', 'M', 'G', '4527', '8537']
Example Output: 56288

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

Example Input: ['2533', '2593', '7691', '1241', 'a', '3189', '5561', 'J', '4143', 'n', 'I', '6597', '3349', '611', 'U']
Example Output:
37508