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', '7305', '8903', 'b', '7687', '6393', '6939']
[A]: 37227


[Q]: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
[A]: 33865


[Q]: ['D', '5533', '8551', 'A', '2229', '1949', 'A', 'J', '3663', '4977', 'M', '3029', '7291']
[A]:
37222