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]: ['3145', 'C', '7725', 'k', 'z']
[A]: 10870


[Q]: ['j', 'A', 'L', 'i', 'I', '3827', '8245', 'H', 'J', '8117', 'w', '4659', 'Y', 'x', 'K']
[A]: 24848


[Q]: ['E', '209', '7571', 'c', 'd', 'o', '1861', '5957']
[A]:
15598