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.
['9045', '4953', '8727', 'A', 'n', 'v', '4667', 'x', 'i', '161', '5715', '6651', '3159', '4621', 'u', '2441', 'T', '4031', '2291', 'f']