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]: ['w', '2281', '8651', '2203', 'q', 'n', '4253']
[A]: 17388


[Q]: ['v', '3135', 'J', 'm', 'a']
[A]: 3135


[Q]: ['5149', 'D', '5687', 'L', 'A']
[A]:
10836