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.

['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']
11769

['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']
64912

['U', '5821', 'f', 'Q', 'A', 'R', 'v', 'Q', 'Y', 'V', 'S', '6075', '4879', '9139']

25914