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]: ['Y', 'X']
[A]: 0


[Q]: ['8755', 'A', '2893', '6703']
[A]: 18351


[Q]: ['8505', '1141', 'E', '8975', 'J', 'T', 'G', '3747', '3245', '5213', 'G', '1703', '7565', '1137', '1361']
[A]:
42592