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.
['8817', 'c', 'r', 'E', '8183', 'X', '9101', 'Q', 'k', '4153', 'e', '1747', '513', '9161', '1111', '5147', 'r', 'M', 'A']