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: ['3145', 'C', '7725', 'k', 'z']

A: 10870
****
Q: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']

A: 41628
****
Q: ['z', '6471', '4979', '7903', 'Z', 'a', 'u', 'l', '3465', '9345', 'g']

A:
32163
****