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.
['9963', 't', '8323', 'Z', 'j', 'Z', 'k', 'C', 'Q', 'W', 'j', 'D', '7361', 'k', 'V', 'j', '4043', 'C', 'h']