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.
['9167', 's', 'B', '2285', '999', '2655', 'O', 'G', 'C', 's', 'l', 'g', 'q', '7971', 'P', 'T', '9089', 'A']