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]: ['v', 't', 'a', 'r', 'O', 'I']
[A]: 0


[Q]: ['4437', '1265', '1519', 'K', 'Q', 'b', 'n', 'J', '6631', 'K', 'q', 'D', 'U', 'u', '3653', '5169', 'L', 's']
[A]: 22674


[Q]: ['9235', '8719', 'X', '6589', 'c', '4705', '1419', '999', 'R', 'm', 'v', '1547', 'o', '8019', '527', '7527', '6857', 'q', 'j']
[A]:
56143