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]: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']
[A]: 15717


[Q]: ['4607', 'T', 'a', '6077', 'c', '4761']
[A]: 15445


[Q]: ['2637', '2479', '6667', 'Q', 'a', '3757', '621', 'n', '2639', 'y', '8195', '6081', 't', 'n', '1115']
[A]:
34191