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: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']
Example Output: 14668

Example Input: ['K', 'O', 'p', '1669', '8647', '3417', 'a', '8903', 'V', 'E', 'l', 'a', '5177', 'J', '6559', '5377', 'X', '9427']
Example Output: 49176

Example Input: ['g', '7903', '2653', 'c', '425', 'z', 'I', '1997', '617', 'i', '9009', '9917', '6993', '3517', 'M', '8237', '8027', 't', 'R']
Example Output:
59295