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', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']