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]: ['a', 'j', 'v', '619', 't', 'a', '5777', 'x', 'R', 'P', '8897', 'j']
[A]: 15293


[Q]: ['W', 'H', 'k', 'L', '2425']
[A]: 2425


[Q]: ['6167', '925', '8953']
[A]:
16045