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]: ['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']
[A]: 74579


[Q]: ['2225', '1925']
[A]: 4150


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