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: ['7763', '6003', 'V']
Example Output: 13766

Example Input: ['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']
Example Output: 25220

Example Input: ['q', '7217', 'o']
Example Output:
7217