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: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']

A: 34764
****
Q: ['9211', '1889', '7371', '9649', 'b', 'y', 'q', 'a', 'i', '1137', '3291', '8625']

A: 41173
****
Q: ['8107', 'z', 'N', '9903', '5495', '1593', 'l', 'y', '5309', 'D', 'O', '4405']

A:
34812
****