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.
['1165', 'b', 'Z', 'J', '2673', 'q', 'g', 'M', 'd', '9129', '3571', '3387', '3647', '4279', 'Q', 'P', '4733', '1353', '9295']