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]: ['D', 'P', 'y', '4891', '1539', 'J', '5737']
[A]: 12167


[Q]: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
[A]: 33509


[Q]: ['i', '3435', '4981', 'W', 'u', '9941', 'C', '5477', '9231', '8515', '3093', 'I', 'O', 'l', 'C', 'j']
[A]:
44673