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: ['A', 'y', 'u', 'S']

A: 0
****
Q: ['8609', '8045', '2517', '3821', 'x', '3895', 't']

A: 26887
****
Q: ['3145', 'C', '7725', 'k', 'z']

A:
10870
****