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.

['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']
15672

['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']
14077

['3853', 'U', 'Q', '2605', 'H', '7761', 'K', '4949', '5057', '1787', 'J', '7119', 'o', '1733', '9899', 'V', 'a', 'F', '833']

45596