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: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']
Example Output: 17925

Example Input: ['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']
Example Output: 47287

Example Input: ['2585', '3043', 'w', '7697', '53', 't', 'A']
Example Output:
13378