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.
['V', 'z', '3175', 'Q', 'H', '9125', '8527', '7887', 'w', 's', 'n', '2247', 'O', '911', 'O', 'G', '6127', '7953']