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]: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']
[A]: 27674


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


[Q]: ['K', 'a', '5233', '221', 'N', '797', 'l']
[A]:
6251