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: ['3705', '9217', 'C', '4609']

A: 17531
****
Q: ['Z', '4157', '5185', 'U', 'i', '1115', 'A', '7427', '3313', 'S']

A: 21197
****
Q: ['4483', '9929', '2829', 'X', 'r', 'i', '2947', 'w', '2361', 'L', 'N', 'D', '3711', 'q', 'm', 'z', '8789', 'l', '5157', '3171']

A:
43377
****