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.
['595', 'M', '8095', 'M', 'X', 'w', '7251', 'Y', '5887', '8441', '3455', 'p', 'H', '1093', '3851', 'V', 'p', 'T']