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.
['5341', 'o', '1005', 'x', 'm', 'j', 'i', 'Z', '4427', 'h', '2103', '9087', 'z', 'W', '1161', 'v', '1041', '5501']