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: ['5095', '8235', '4901', 's', '4177', '3077', 'l']
Example Output: 25485

Example Input: ['U', '9593', '2079', '5959', 'T', '5849', 'w', 'b', '9743', '6689', 'k', 'J']
Example Output: 39912

Example Input: ['i', 'p', 'A', 'H', 'd', 'g', 'w', 'f', '7169', '8461', 'C', 'A', 'j', 'n']
Example Output:
15630