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.
['q', '2975', 'v', 'e', '3365', '8123', '1625', '8137', '1619', 'M', 'm', '2603', '2267', 'o', '5675', 'T', '997', '3341']