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: ['1319', '6105', '1119', 'c', 'p', '7617', '5113', 'a', '5115', '6731', '6693']
Example Output: 39812

Example Input: ['h', 'a', '1645', '2391', '759', '519', '3331', '2831', '3427', '9893', 'u', 'J', '7391', '8379', 'V']
Example Output: 40566

Example Input: ['1647', '1923', 'n', 'P', 'U', 'x', 's', '1145', 'm', '3985', 'h', 'K', '3361', '3075', '6491', 'q', '2629', '5459']
Example Output:
29715