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]: ['2039', '1679', '9675', 'S', 'J', '2069', 'r', 'e']
[A]: 15462


[Q]: ['o', 'a', 'K', '6031']
[A]: 6031


[Q]: ['s', '3651']
[A]:
3651