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]: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
[A]: 5636


[Q]: ['6293', 'o']
[A]: 6293


[Q]: ['5473', 'Q']
[A]:
5473