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]: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']
[A]: 27674


[Q]: ['543', '8351', 'I', 'M', '6647', '731', 'b', 'r', 'l', '3935', 'k', 'z', 'v', '2131', '7781', 'X', '9419', '5013', 'F']
[A]: 44551


[Q]: ['6491', '3499', '1651', 's', 'H', '145', 'z', '3481', '1663', 'T', '393']
[A]:
17323