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]: ['9787', '1491', '4411', '5261', 'U', '9787', 'b']
[A]: 30737


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


[Q]: ['1673', '8187', '47', 'q', 'f', '7217', 'J', 'a', '8677', 'C', '1573', 'P']
[A]:
27374