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]: ['D', 'K', 'n', 'd', 'i', 'U']
[A]: 0


[Q]: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']
[A]: 17925


[Q]: ['703', 'w', 'n', 'S', 'y', '9135', '6395', 'c', '6085', 'a', '9405']
[A]:
31723