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: ['B', '9189', '3691', '2869', '1525', 'd', 'H', 'P', '8613', 'b', 'r', '5289', 'V', '6433', '8733', 'K', '8105', '1041', 'U', 'L']
Example Output: 55488

Example Input: ['3565', 'z', '8811', 'z', 'U', '113', 'I', '1307', '135', 'V', 'P', '5183', '2505', '4863', '1113', 'A', '7575', '827', 'B']
Example Output: 35997

Example Input: ['Z', '9161', '6629', '5345', 'r', 'O', 'r', '7959', 'f', '5499', 's', 'N', '6787', '9391', '8033', '5395', 'z', '7487', 'R', 'c']
Example Output:
71686