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.
['7215', 'd', 'q', 'k', '9301', 'P', 'x', 'C', 'g', 'e', 'o', '2769', '6993', '9769', 'v', '9007', '4131', '8627', 'q']