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.
['1591', 'v', '8967', '7783', 'v', 'j', 'L', 'i', '5119', 'N', '2507', 'j', 'A', 'y', '2681', '8961', 'H', '2187', 'h', '5677']