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]: ['n', 'm', 'Y', 'v']
[A]: 0


[Q]: ['i', 'C', '5373', '2017', 'm', '5435', 'Y', 'h']
[A]: 12825


[Q]: ['7995', '7451', '2139', '8205', 's', 'r', '775']
[A]:
26565