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.

['4701', 'b', 'i', 'B', 'z', '7837', 'W']
12538

['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']
44213

['f', 'a', '7173', '35', '5449', '8059', 's']

20716