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', '1669']
1669

['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
8317

['J', '5149', 'H', 'L', 'm', 'h', '3863', 'n', 'z']

9012