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.

['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
5636

['9863', 'y']
9863

['9311', '3979']

13290