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]: ['5573', '6221', 'C', '8649', '6603', 'q', '9403']
[A]: 36449


[Q]: ['q', 'U', 'I', '5245', 'g', 'Y', 's', 'V', 'b', 'V', 'D', '1193', 'p']
[A]: 6438


[Q]: ['Y', '8281', 'f', '6645', 'Z', 'K', '6251', 'k', 'R', 'y', '4857', 'v', '1733', 'i']
[A]:
27767