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: ['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']
Example Output: 42641

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

Example Input: ['635', 'X', 'P', 'C', '8873', 'F', 'N', '9479', 'Z', '1569', '4311', 'f', '6457', 'A', '693', 'o', 'H']
Example Output:
32017