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]: ['j', 'R', '2435']
[A]: 2435


[Q]: ['z', 'E', 'u', '4437', '7767']
[A]: 12204


[Q]: ['5597', '2983', '181', 'O', 'm', 'O', '6211', 'Y']
[A]:
14972