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]: ['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']
[A]: 55013


[Q]: ['B', 's']
[A]: 0


[Q]: ['611', '8475', '9229', 'D', 'P', '1265', '5687', '5591']
[A]:
30858