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: ['b', '5689', '119', 'p', 'P', 'J', 'w', 'm', '7397', 'Y', '447', 'O', 'p', '319', 'H', 'U']
Example Output: 13971

Example Input: ['6833', 'R', '7323', 'd', '3487', '8777', '9053', 'y', 'i', 'O', '467', 'b', '5969', 'D', 'B', 'r', '3073', 'i', 't', 'd']
Example Output: 44982

Example Input: ['7499', '2641', '5431', '8213', '4159', '6035', 'E', 'f', 'g', 'T', '4517', '635']
Example Output:
39130