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]: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
[A]: 14284


[Q]: ['j', '6731', 'h', 'G', 'F', '6899', '4317', 'm', '9491', 'l', '971']
[A]: 28409


[Q]: ['S', '8769', 'y', '1009', 's', '6083', 'I', 'g', 'm', '4703', 'w', 'T', 'O', 'X', '6927', '8259', '9125', '8309', '4661']
[A]:
57845