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: ['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

A: 5708
****
Q: ['4159', 'H', 'h', 'W', 'w', 'i', 'G', 'l', 'j', '5467', '9219', 'j', 'q', 'n', '5465', '6197', 'J', 'y']

A: 30507
****
Q: ['C', 'e', '6399']

A:
6399
****