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.
['5841', '4725', 'r', '9905', 'e', '1183', '9551', '3027', '6397', '3763', 'I', 'C', 'V', '307', 'r', 'h', 'e', '3307', 'J', 'Q']