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.
['547', '1387', 'B', 'j', 'P', 'T', '9223', 'D', 'E', '1183', '2477', '2101', '3305', '245', '1645', '3193', 'D', '2723']