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.
['4363', 'W', '2477', 'o', 'C', 'G', '9893', '2037', 'F', 'J', '6385', '7269', '343', '1163', 'Q', 'A', 'O', '4747']