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: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
Example Output: 14215

Example Input: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
Example Output: 30645

Example Input: ['Y', 'U', '3265', 'h', 'D']
Example Output:
3265