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: ['3809', '9401', '63', '5705', 'u', '6275', 'k', 'l', '1171', '9365', 'L', 'O', '7431', '8567', 'h', '6135']
Example Output: 57922

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

Example Input: ['g', 'y', '7811', 'J', 'b', 'e', 'G', 'H', '5715', 'E', 'q', 'Z', 'r', '159', '9131', 'j', 'Q', 'b', 't', '51']
Example Output:
22867