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: ['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']
Example Output: 18610

Example Input: ['Q', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']
Example Output: 55057

Example Input: ['G', 'n', 'g', '9709', 'u', 'Y']
Example Output:
9709