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]: ['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']
[A]: 12030


[Q]: ['L', 'i', '9225', 'w', '5365', '8077', '2733', 'W', '8493', 'B']
[A]: 33893


[Q]: ['v', 'N', '7345', '8263', 'S', 'P', 'Q']
[A]:
15608