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.
['4153', 'I', '5249', '263', '3103', '9873', 'D', '7813', 'v', '2689', '7091', '6059', '3245', 'g', 'b', 'f', 'o', 'o', 'V', 'A']