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.
['k', '2211', 'Z', '8319', 'f', 'o', 'U', '1293', '9697', '2203', 'H', '3033', 'n', 'H', 'M', '3667', 'g', '1053', '5153', '6067']