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]: ['t', 'x', '5629', 'k', '2003', 'v', '541', 'l', 'v', '7983', '677', '6173', 'z', 'J', 's', 'u', '2187', 'Y']
[EX A]: 25193

[EX Q]: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']
[EX A]: 35458

[EX Q]: ['8185', '3975', 'G', 'C', 'r', '1999', '8253']
[EX A]:
22412