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', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']
Example Output: 55807

Example Input: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
Example Output: 33509

Example Input: ['h', 'V', 'q', 'r', '9219', '1403', '6365', '2305', '5299', '9847', '7647', '6191', '4325', 'x', 'T', 'B']
Example Output:
52601