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.

['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']
38819

['2237', '2597', '2593', 'Y', '5345', 'g', 'l', 'I', 'p', 'u', 'L', 'T', '617', '9759', 'b', 'w', '7097', '9863']
40108

['a', '2085', 'l', '2411', '9013', '8233', 'm', 'X', '8795', 'O', 'c', '9935', '1797', '77', 'X', 'y', '715']

43061