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]: ['w', '1335', 'G', 'h', '6729', '1999', 'u', 'I', 'r', 'm', '4757', 'W', '3715', '701', '1999']
[EX A]: 21235

[EX Q]: ['4145', 't']
[EX A]: 4145

[EX Q]: ['V', '8615', '7915', '5415', 'q', '6049', 'i', 'A', 'X', '7633', 'a']
[EX A]:
35627