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]: ['6669', 'n', 't', 'N', 'x', '8153', 'W', 'v', 'B', '3181', 'y', 'e', '3491']
[A]: 21494


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


[Q]: ['3799', '8069', '2181', 'S', 'e', '3487', '5763', '6713', 'l', 'A', '9527', '5381', '6929']
[A]:
51849