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.

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

['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']
63356

['N', 'n', 'y', 'p', '7875', '7975', 'h', '7981', 'K', '169', '5471', '9139', 'N', 'M', 'p', '835', '9535', 'V', 'V', '7499']

56479