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]: ['4749', '1169', '4273', 'X']
[A]: 10191


[Q]: ['U', '5885', 'u', 'Y', 's', 'w', 'j', '9629', '9505', 'U']
[A]: 25019


[Q]: ['G', 'r', '8485', 'i']
[A]:
8485