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.
['h', '8469', 'q', 'F', '469', '4963', '6877', 'n', '3119', '5923', '7301', 'm', 'C', '8447', 'c', 'L', '9167', 'X', '4409', 'T']