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]: ['5573', '6221', 'C', '8649', '6603', 'q', '9403']
[A]: 36449


[Q]: ['4177', 'd', 'b', 'm', 'f', 'R', '797', '7905', '4355', '7515', '9801', 'F', 'R', '9125', '8445', 'k', 'K', 'K']
[A]: 52120


[Q]: ['3155', '8457', '7413', 'Y', '4385', '5037', 'p', 't', 'r', 'N', 'l', '5685', '6889', 'B']
[A]:
41021