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.

[EX Q]: ['D', 'K', 'n', 'd', 'i', 'U']
[EX A]: 0

[EX Q]: ['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']
[EX A]: 14077

[EX Q]: ['P', '1175', '9611', 'o', '8893', '5373', 'r', 'P', 'd', '5343', '4295', 'd', '3857', '3865', 'y', 'U', 'U']
[EX A]:
42412