Q: 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.
['9899', 'l', '1951', '3733', 'm', 'i', '5175', 'O', 'J', 'F', '8149', 'r', 'D', '6313', 'd', 'q', 'a', '35']
A:
35255