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.

['6217', 'A', '1925', 'o', '1433']
9575

['Q', '8317', '8989']
17306

['G', 'd', 'z', '9293', '5875', '4429', 'L', '1629', 'H', '7609', 'C', 'V']

28835