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: ['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']

A: 39416
****
Q: ['1693', '9237', '7591', '1593', 'R', '6295', '9379']

A: 35788
****
Q: ['Q', '6585', 'x', 'D', 'H', 'c', 'T', 'z']

A:
6585
****