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]: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']
[EX A]: 28458

[EX Q]: ['V', '2633', '3269', 'r', 'Q', '3517', '2571', 'G', '4105', 'm', 'z', 'B', 'A']
[EX A]: 16095

[EX Q]: ['4079', 'j', '8013', '3445']
[EX A]:
15537