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]: ['7293', '2619', '2459', '3829', 'J', 'c', 'a', 'a', '311', 'x', 'r', '6123', '2847', '4809']
[A]: 30290


[Q]: ['X', 'f', 'p', 'R', 'N']
[A]: 0


[Q]: ['y', 'c', 'U', '4831', '3413', 'J', 'b', 'n', 'P', '449', 'l', 'd', 'w', 'q', 'U', '4031', 'N', '257', '3295']
[A]:
16276