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: ['6165', 'x', 'u', 'n', 'V', 'B', '4039', 'l', '991', 'x', '335', '9011', 'K', '8725', 'a', '6291', 'j']

A: 35557
****
Q: ['q', 'k', '1375', 'i', 'k', '3751', '9879', '353', '3753', '6161', '8651', 'X', '5949', 'x', '4683', '9117', 'O', 'Q', '9817']

A:
63489
****