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.

['n', 'm', 'Y', 'v']
0

['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']
42558

['611', '9959', '2501', '1577', 'Y', '4073', '4947', '7093', 'D', 'H', 'e', 'C', '5911', 'U', '7099', '5207']

48978