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]: ['8609', '8045', '2517', '3821', 'x', '3895', 't']
[A]: 26887


[Q]: ['U', 'd', '893', 'h', '9679', '315', 'H', '339', '2381', '847', '7951', 'e', '9269', '9081', 'o', '6439', 'N', '4531']
[A]: 51725


[Q]: ['923', 'N', 'y', '6139', 'd', '2711', 'i', '2265', 'A']
[A]:
12038