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: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']

A: 15208
****
Q: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']

A: 33865
****
Q: ['7813', '6797', '7577', 'X', '6655', 'P', '69']

A:
28911
****