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.

[Q]: ['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']
[A]: 42558


[Q]: ['Q', '8317', '8989']
[A]: 17306


[Q]: ['8593', '4787', 'j', '4277', 'q', 'q', 'h', '6129', 'U', '6697', 'e']
[A]:
30483