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.

['1931', 'u', '499', 'e', '6191', '7317', '6521', '2293', '8237', '6085', 'V', '8051', 'c', '2161', '3469']

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
52755