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]: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
[A]: 33865


[Q]: ['2895', '8095', 'y', '1927', '4827']
[A]: 17744


[Q]: ['2239', 'f', 'f', '5885', 'U', '3457', 'f', '8837']
[A]:
20418