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.

['A', '771', 'Q', 'b', '9929', '4991', 'q', '9863', '4363', '5721', 'C', '991', 'j', 'r', 'Q', 'B', 'K']
36629

['6367', '9923', '9141']
25431

['j', 'X', 'w', 'T', 'N', '9803', 'n', '431', 'B', 'J', 'M', 'l', '1527', '3115', 'k']

14876