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]: ['q', 't', '4837', 'F', '2367', '1867', '8361', 'm']
[A]: 17432


[Q]: ['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']
[A]: 22172


[Q]: ['2977', 'p', '5649', '7903']
[A]:
16529