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]: ['1001', 'T', 'w', 'f', 'Q', '4035', 'b', 'q', 'x', 'R']
[A]: 5036


[Q]: ['187', 'r', '4793', '267', 'X', 'D', 'T', '6789', 'q', 'E', '5089']
[A]:
17125