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]: ['J', '5149', 'H', 'L', 'm', 'h', '3863', 'n', 'z']
[A]: 9012


[Q]: ['7771', 'g']
[A]: 7771


[Q]: ['y', 'b', '3885', 'p', 'l', '9625', 't', 'r']
[A]:
13510