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.
['5827', 'Q', '4477', 'H', '7515', '8149', 'x', 'p', '4897', 'h', 'P', '7491', '3487', '1111', '4337', 'E', 'J', 't', 'P', 'J']