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.
['3513', 'E', 'B', '3325', '9833', '1223', '6929', '6705', '4913', 'e', '115', '9653', '1231', '7723', 'e', 'i', 'H', 'M']