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]: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
[A]: 45451


[Q]: ['8147', '3191']
[A]: 11338


[Q]: ['u', '7099']
[A]:
7099