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: ['t', 'v', 'B', 'Y']
Example Output: 0

Example Input: ['r', '2251', 'X', 'H', 'a', '5463', 'g', 'M', '9797', '1581', 'o', 'm', 'v', 'E']
Example Output: 19092

Example Input: ['9729', 'F', '1829', '439', '5105', '4595', 'P', '8519', 'Q', 'h', '4945', 'U', 'P', 'Y']
Example Output:
35161