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]: ['4515', '3911', 'M', 'T', 'w', 'F']
[EX A]: 8426

[EX Q]: ['4749', '1169', '4273', 'X']
[EX A]: 10191

[EX Q]: ['1591', 'G', 'L', '1145', '1511', 'N', '6845', 'O', '4373', '6703', 'M', '2129']
[EX A]:
24297