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.
['8459', '2207', 'i', 'C', 'i', 'u', '9359', 'n', '2027', 'b', 'b', 'E', '531', '1879', '6455', '3501', '3155', 'U']