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]: ['5899', '229', 'm', '3347', 'k', 'q', 'g', '2755', '8727', '2035', '823', '6835', '9271', 'Q']
[A]: 39921


[Q]: ['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']
[A]: 23475


[Q]: ['C', 'c', 'H', 'd', '241', '4357', '4587', 'S', 'L', 'j', 'y', 'x', 'l', '6321', 'P', 'b', 'o', 'C']
[A]:
15506