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]: ['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']
[A]: 3566


[Q]: ['x', '1887', 'E', '3995', '5677', '2749', '9951']
[A]: 24259


[Q]: ['q', '5151', 'R', '441']
[A]:
5592